// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.7.4;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./WorldToken.sol";

contract WorldFarm is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // Info of each user.
    struct UserInfo {
        uint256 amount; // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        //
        // We do some fancy math here. Basically, any point in time, the amount of WORLD tokens
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accWorldPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accWorldPerShare` (and `lastRewardBlock`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        IERC20 lpToken; // Address of LP token contract.
        uint256 allocPoint; // How many allocation points assigned to this pool. WORLD tokens to distribute per block.
        uint256 lastRewardBlock; // Last block number that WORLD tokens distribution occurs.
        uint256 accWorldPerShare; // Accumulated WORLD tokens per share, times 1e12. See below.
    }

    WorldToken public immutable world; // The WORLD ERC-20 Token.
    uint256 private worldPerBlock; // WORLD tokens distributed per block. Use getWorldPerBlock() to get the updated reward.

    PoolInfo[] public poolInfo; // Info of each pool.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo; // Info of each user that stakes LP tokens.
    uint256 public totalAllocPoint; // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public startBlock; // The block number when WORLD token mining starts.

    uint256 public blockRewardUpdateCycle = 1 days; // The cycle in which the worldPerBlock gets updated.
    uint256 public blockRewardLastUpdateTime = block.timestamp; // The timestamp when the block worldPerBlock was last updated.
    uint256 public blocksPerDay = 6525; // The estimated number of mined blocks per day.
    uint256 public blockRewardPercentage = 1; // The percentage used for worldPerBlock calculation.

    mapping(address => bool) public addedLpTokens; // Used for preventing LP tokens from being added twice in add().

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

    constructor(
        WorldToken _world,
        uint256 _startBlock
    ) {
        require(address(_world) != address(0), "WORLD address is invalid");
        require(_startBlock >= block.number, "startBlock is before current block");

        world = _world;
        startBlock = _startBlock;
    }

    modifier updateWorldPerBlock() {
        (uint256 blockReward, bool update) = getWorldPerBlock();
        if (update) {
            worldPerBlock = blockReward;
            blockRewardLastUpdateTime = block.timestamp;
        }
        _;
    }

    function getWorldPerBlock() public view returns (uint256, bool) {
        if (block.number < startBlock) {
            return (0, false);
        }

        uint256 poolReward = world.balanceOf(address(this));
        if (poolReward == 0) {
            return (0, worldPerBlock != 0);
        }

        if (block.timestamp >= getWorldPerBlockUpdateTime() || worldPerBlock == 0) {
            return (poolReward.mul(blockRewardPercentage).div(100).div(blocksPerDay), true);
        }

        return (worldPerBlock, false);
    }

    function getWorldPerBlockUpdateTime() public view returns (uint256) {
        // if blockRewardUpdateCycle = 1 day then roundedUpdateTime = today's UTC midnight
        uint256 roundedUpdateTime = blockRewardLastUpdateTime - (blockRewardLastUpdateTime % blockRewardUpdateCycle);
        // if blockRewardUpdateCycle = 1 day then calculateRewardTime = tomorrow's UTC midnight
        uint256 calculateRewardTime = roundedUpdateTime + blockRewardUpdateCycle;
        return calculateRewardTime;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    // Add a new lp to the pool. Can only be called by the owner.
    function add(
        uint256 _allocPoint,
        IERC20 _lpToken,
        bool _withUpdate
    ) public onlyOwner {
        require(address(_lpToken) != address(0), "LP token is invalid");
        require(!addedLpTokens[address(_lpToken)], "LP token is already added");

        require(_allocPoint >= 5 && _allocPoint <= 10, "_allocPoint is outside of range 5-10");

        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(PoolInfo({
            lpToken : _lpToken,
            allocPoint : _allocPoint,
            lastRewardBlock : lastRewardBlock,
            accWorldPerShare : 0
        }));

        addedLpTokens[address(_lpToken)] = true;
    }

    // Update the given pool's WORLD token allocation point. Can only be called by the owner.
    function set(
        uint256 _pid,
        uint256 _allocPoint,
        bool _withUpdate
    ) public onlyOwner {
        require(_allocPoint >= 5 && _allocPoint <= 10, "_allocPoint is outside of range 5-10");

        if (_withUpdate) {
            massUpdatePools();
        }
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
        poolInfo[_pid].allocPoint = _allocPoint;
    }

    // View function to see pending WORLD tokens on frontend.
    function pendingRewards(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accWorldPerShare = pool.accWorldPerShare;
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = block.number.sub(pool.lastRewardBlock);
            (uint256 blockReward, ) = getWorldPerBlock();
            uint256 worldReward = multiplier.mul(blockReward).mul(pool.allocPoint).div(totalAllocPoint);
            accWorldPerShare = accWorldPerShare.add(worldReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(accWorldPerShare).div(1e12).sub(user.rewardDebt);
    }

    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    // Update reward variables of the given pool to be up-to-date when lpSupply changes
    // For every deposit/withdraw pool recalculates accumulated token value
    function updatePool(uint256 _pid) public updateWorldPerBlock {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }

        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (lpSupply == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }

        uint256 multiplier = block.number.sub(pool.lastRewardBlock);
        uint256 worldReward = multiplier.mul(worldPerBlock).mul(pool.allocPoint).div(totalAllocPoint);

        // no minting is required, the contract should have WORLD token balance pre-allocated
        // accumulated WORLD per share is stored multiplied by 10^12 to allow small 'fractional' values
        pool.accWorldPerShare = pool.accWorldPerShare.add(worldReward.mul(1e12).div(lpSupply));
        pool.lastRewardBlock = block.number;
    }

    // Deposit LP tokens to WorldFarming for WORLD token allocation.
    function deposit(uint256 _pid, uint256 _amount) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        updatePool(_pid);

        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accWorldPerShare).div(1e12).sub(user.rewardDebt);
            if (pending > 0) {
                safeTokenTransfer(msg.sender, pending);
            }
        }
        if (_amount > 0) {
            pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }
        user.rewardDebt = user.amount.mul(pool.accWorldPerShare).div(1e12);
        emit Deposit(msg.sender, _pid, _amount);
    }

    // Withdraw LP tokens from WorldFarming
    function withdraw(uint256 _pid, uint256 _amount) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        require(user.amount >= _amount, "Withdraw amount is greater than user amount");

        updatePool(_pid);

        uint256 pending = user.amount.mul(pool.accWorldPerShare).div(1e12).sub(user.rewardDebt);
        if (pending > 0) {
            safeTokenTransfer(msg.sender, pending);
        }
        if (_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(address(msg.sender), _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accWorldPerShare).div(1e12);
        emit Withdraw(msg.sender, _pid, _amount);
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        user.amount = 0;
        user.rewardDebt = 0;

        pool.lpToken.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
    }

    // Safe WORLD token transfer function, just in case if
    // rounding error causes pool to not have enough WORLD tokens
    function safeTokenTransfer(address _to, uint256 _amount) internal {
        uint256 balance = world.balanceOf(address(this));
        uint256 amount = _amount > balance ? balance : _amount;
        world.transfer(_to, amount);
    }

    function setBlockRewardUpdateCycle(uint256 _blockRewardUpdateCycle) external onlyOwner {
        require(_blockRewardUpdateCycle > 0, "Value is zero");
        blockRewardUpdateCycle = _blockRewardUpdateCycle;
    }

    // Just in case an adjustment is needed since mined blocks per day
    // changes constantly depending on the network
    function setBlocksPerDay(uint256 _blocksPerDay) external onlyOwner {
        require(_blocksPerDay >= 6200 && _blocksPerDay <= 7000, "Value is outside of range 6200-7000");
        blocksPerDay = _blocksPerDay;
    }

    function setBlockRewardPercentage(uint256 _blockRewardPercentage) external onlyOwner {
        require(_blockRewardPercentage >= 1 && _blockRewardPercentage <= 5, "Value is outside of range 1-5");
        blockRewardPercentage = _blockRewardPercentage;
    }
}

/*
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     ╚══╝╚══╝  ╚═════╝ ╚═╝  ╚═╝╚══════╝╚═════╝        ╚═╝    ╚═════╝ ╚═╝  ╚═╝╚══════╝╚═╝  ╚═══╝

*/

// SPDX-License-Identifier: MIT

pragma solidity 0.7.4;

import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract WorldToken is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    string private constant NAME = "World Token";
    string private constant SYMBOL = "WORLD";
    uint8 private constant DECIMALS = 18;

    mapping(address => uint256) private rewards;
    mapping(address => uint256) private actual;
    mapping(address => mapping(address => uint256)) private allowances;

    mapping(address => bool) private excludedFromFees;
    mapping(address => bool) private excludedFromRewards;
    address[] private rewardExcluded;

    uint256 private constant MAX = ~uint256(0);
    uint256 private constant ACTUAL_TOTAL = 100_000_000 * 1e18;
    uint256 private rewardsTotal = (MAX - (MAX % ACTUAL_TOTAL));
    uint256 private holderFeeTotal;
    uint256 private marketingFeeTotal;
    uint256 private lpFeeTotal;
    uint256 private merchantFeeTotal;

    uint256 public taxPercentage = 3;
    uint256 public holderTaxAlloc = 10;
    uint256 public marketingTaxAlloc = 10;
    uint256 public lpTaxAlloc = 10;
    uint256 public merchantTaxAlloc;
    uint256 public totalTaxAlloc = marketingTaxAlloc.add(holderTaxAlloc).add(lpTaxAlloc).add(merchantTaxAlloc);

    address public marketingAddress;
    address public lpStakingAddress;
    address public merchantStakingAddress;

    constructor(address _marketingAddress) {
        rewards[_marketingAddress] = rewardsTotal;
        emit Transfer(address(0), _marketingAddress, ACTUAL_TOTAL);

        marketingAddress = _marketingAddress;

        excludeFromRewards(_msgSender());
        excludeFromFees(_marketingAddress);

        if (_marketingAddress != _msgSender()) {
            excludeFromRewards(_marketingAddress);
            excludeFromFees(_msgSender());
        }

        excludeFromFees(address(0x000000000000000000000000000000000000dEaD));
    }

    function name() external pure returns (string memory) {
        return NAME;
    }

    function symbol() external pure returns (string memory) {
        return SYMBOL;
    }

    function decimals() external pure returns (uint8) {
        return DECIMALS;
    }

    function totalSupply() external pure override returns (uint256) {
        return ACTUAL_TOTAL;
    }

    function balanceOf(address _account) public view override returns (uint256) {
        if (excludedFromRewards[_account]) {
            return actual[_account];
        }
        return tokenWithRewards(rewards[_account]);
    }

    function transfer(address _recipient, uint256 _amount) public override returns (bool) {
        _transfer(_msgSender(), _recipient, _amount);
        return true;
    }

    function allowance(address _owner, address _spender) public view override returns (uint256) {
        return allowances[_owner][_spender];
    }

    function approve(address _spender, uint256 _amount) public override returns (bool) {
        _approve(_msgSender(), _spender, _amount);
        return true;
    }

    function transferFrom(
        address _sender,
        address _recipient,
        uint256 _amount
    ) public override returns (bool) {
        _transfer(_sender, _recipient, _amount);

        _approve(
        _sender,
            _msgSender(),
            allowances[_sender][_msgSender()].sub(_amount, "ERC20: transfer amount exceeds allowance")
        );

        return true;
    }

    function increaseAllowance(address _spender, uint256 _addedValue) public virtual returns (bool) {
        _approve(_msgSender(), _spender, allowances[_msgSender()][_spender].add(_addedValue));
        return true;
    }

    function decreaseAllowance(address _spender, uint256 _subtractedValue) public virtual returns (bool) {
        _approve(
            _msgSender(),
            _spender,
            allowances[_msgSender()][_spender].sub(_subtractedValue, "ERC20: decreased allowance below zero")
        );
        return true;
    }

    function isExcludedFromRewards(address _account) external view returns (bool) {
        return excludedFromRewards[_account];
    }

    function isExcludedFromFees(address _account) external view returns (bool) {
        return excludedFromFees[_account];
    }

    function totalFees() external view returns (uint256) {
        return holderFeeTotal.add(marketingFeeTotal).add(lpFeeTotal).add(merchantFeeTotal);
    }

    function totalHolderFees() external view returns (uint256) {
        return holderFeeTotal;
    }

    function totalMarketingFees() external view returns (uint256) {
        return marketingFeeTotal;
    }

    function totalLpFees() external view returns (uint256) {
        return lpFeeTotal;
    }

    function totalMerchantFees() external view returns (uint256) {
        return merchantFeeTotal;
    }

    function distribute(uint256 _actualAmount) public {
        address sender = _msgSender();
        require(!excludedFromRewards[sender], "Excluded addresses cannot call this function");

        (uint256 rewardAmount, , , , ) = _getValues(_actualAmount);
        rewards[sender] = rewards[sender].sub(rewardAmount);
        rewardsTotal = rewardsTotal.sub(rewardAmount);
        holderFeeTotal = holderFeeTotal.add(_actualAmount);
    }

    function excludeFromFees(address _account) public onlyOwner() {
        require(!excludedFromFees[_account], "Account is already excluded from fee");
        excludedFromFees[_account] = true;
    }

    function includeInFees(address _account) public onlyOwner() {
        require(excludedFromFees[_account], "Account is already included in fee");
        excludedFromFees[_account] = false;
    }

    function excludeFromRewards(address _account) public onlyOwner() {
        require(!excludedFromRewards[_account], "Account is already excluded from reward");

        if (rewards[_account] > 0) {
            actual[_account] = tokenWithRewards(rewards[_account]);
        }

        excludedFromRewards[_account] = true;
        rewardExcluded.push(_account);
    }

    function includeInRewards(address _account) public onlyOwner() {
        require(excludedFromRewards[_account], "Account is already included in rewards");

        for (uint256 i = 0; i < rewardExcluded.length; i++) {
            if (rewardExcluded[i] == _account) {
                rewardExcluded[i] = rewardExcluded[rewardExcluded.length - 1];
                actual[_account] = 0;
                excludedFromRewards[_account] = false;
                rewardExcluded.pop();
                break;
            }
        }
    }

    function _approve(
        address _owner,
        address _spender,
        uint256 _amount
    ) private {
        require(_owner != address(0), "ERC20: approve from the zero address");
        require(_spender != address(0), "ERC20: approve to the zero address");

        allowances[_owner][_spender] = _amount;
        emit Approval(_owner, _spender, _amount);
    }

    function _transfer(
        address _sender,
        address _recipient,
        uint256 _amount
    ) private {
        require(_sender != address(0), "ERC20: transfer from the zero address");
        require(_recipient != address(0), "ERC20: transfer to the zero address");
        require(_amount > 0, "Transfer amount must be greater than zero");

        uint256 currentTaxPercentage = taxPercentage;
        if (excludedFromFees[_sender] || excludedFromFees[_recipient]) {
            taxPercentage = 0;
        } else {
            uint256 fee = _getFee(_amount);
            uint256 marketingFee = _getMarketingFee(fee);
            uint256 lpFee = _getLpFee(fee);
            uint256 merchantFee = _getMerchantFee(fee);

            _updateMarketingFee(marketingFee);
            _updateLpFee(lpFee);
            _updateMerchantFee(merchantFee);
        }

        if (excludedFromRewards[_sender] && !excludedFromRewards[_recipient]) {
            _transferWithoutSenderRewards(_sender, _recipient, _amount);
        } else if (!excludedFromRewards[_sender] && excludedFromRewards[_recipient]) {
            _transferWithRecipientRewards(_sender, _recipient, _amount);
        } else if (!excludedFromRewards[_sender] && !excludedFromRewards[_recipient]) {
            _transferWithRewards(_sender, _recipient, _amount);
        } else if (excludedFromRewards[_sender] && excludedFromRewards[_recipient]) {
            _transferWithoutRewards(_sender, _recipient, _amount);
        } else {
            _transferWithRewards(_sender, _recipient, _amount);
        }

        if (currentTaxPercentage != taxPercentage) {
            taxPercentage = currentTaxPercentage;
        }
    }

    function _transferWithRewards(
        address _sender,
        address _recipient,
        uint256 _actualAmount
    ) private {
        (
            uint256 rewardAmount,
            uint256 rewardTransferAmount,
            uint256 rewardFee,
            uint256 actualTransferAmount,
            uint256 actualFee
        ) = _getValues(_actualAmount);

        rewards[_sender] = rewards[_sender].sub(rewardAmount);
        rewards[_recipient] = rewards[_recipient].add(rewardTransferAmount);
        _updateHolderFee(rewardFee, actualFee);
        emit Transfer(_sender, _recipient, actualTransferAmount);
    }

    function _transferWithRecipientRewards(
        address _sender,
        address _recipient,
        uint256 _actualAmount
    ) private {
        (
            uint256 rewardAmount,
            uint256 rewardTransferAmount,
            uint256 rewardFee,
            uint256 actualTransferAmount,
            uint256 actualFee
        ) = _getValues(_actualAmount);

        rewards[_sender] = rewards[_sender].sub(rewardAmount);
        actual[_recipient] = actual[_recipient].add(actualTransferAmount);
        rewards[_recipient] = rewards[_recipient].add(rewardTransferAmount);
        _updateHolderFee(rewardFee, actualFee);
        emit Transfer(_sender, _recipient, actualTransferAmount);
    }

    function _transferWithoutSenderRewards(
        address _sender,
        address _recipient,
        uint256 _actualAmount
    ) private {
        (
            uint256 rewardAmount,
            uint256 rewardTransferAmount,
            uint256 rewardFee,
            uint256 actualTransferAmount,
            uint256 actualFee
        ) = _getValues(_actualAmount);

        actual[_sender] = actual[_sender].sub(_actualAmount);
        rewards[_sender] = rewards[_sender].sub(rewardAmount);
        rewards[_recipient] = rewards[_recipient].add(rewardTransferAmount);
        _updateHolderFee(rewardFee, actualFee);
        emit Transfer(_sender, _recipient, actualTransferAmount);
    }

    function _transferWithoutRewards(
        address _sender,
        address _recipient,
        uint256 _actualAmount
    ) private {
        (
            uint256 rewardAmount,
            uint256 rewardTransferAmount,
            uint256 rewardFee,
            uint256 actualTransferAmount,
            uint256 actualFee
        ) = _getValues(_actualAmount);

        actual[_sender] = actual[_sender].sub(_actualAmount);
        rewards[_sender] = rewards[_sender].sub(rewardAmount);
        actual[_recipient] = actual[_recipient].add(actualTransferAmount);
        rewards[_recipient] = rewards[_recipient].add(rewardTransferAmount);
        _updateHolderFee(rewardFee, actualFee);
        emit Transfer(_sender, _recipient, actualTransferAmount);
    }

    function _updateHolderFee(uint256 _rewardFee, uint256 _actualFee) private {
        rewardsTotal = rewardsTotal.sub(_rewardFee);
        holderFeeTotal = holderFeeTotal.add(_actualFee);
    }

    function _updateMarketingFee(uint256 _marketingFee) private {
        if (marketingAddress == address(0)) {
            return;
        }

        uint256 rewardsRate = _getRewardsRate();
        uint256 rewardMarketingFee = _marketingFee.mul(rewardsRate);
        marketingFeeTotal = marketingFeeTotal.add(_marketingFee);

        rewards[marketingAddress] = rewards[marketingAddress].add(rewardMarketingFee);
        if (excludedFromRewards[marketingAddress]) {
            actual[marketingAddress] = actual[marketingAddress].add(_marketingFee);
        }
    }

    function _updateLpFee(uint256 _lpFee) private {
        if (lpStakingAddress == address(0)) {
            return;
        }

        uint256 rewardsRate = _getRewardsRate();
        uint256 rewardLpFee = _lpFee.mul(rewardsRate);
        lpFeeTotal = lpFeeTotal.add(_lpFee);

        rewards[lpStakingAddress] = rewards[lpStakingAddress].add(rewardLpFee);
        if (excludedFromRewards[lpStakingAddress]) {
            actual[lpStakingAddress] = actual[lpStakingAddress].add(_lpFee);
        }
    }

    function _updateMerchantFee(uint256 _merchantFee) private {
        if (merchantStakingAddress == address(0)) {
            return;
        }

        uint256 rewardsRate = _getRewardsRate();
        uint256 rewardMerchantFee = _merchantFee.mul(rewardsRate);
        merchantFeeTotal = merchantFeeTotal.add(_merchantFee);

        rewards[merchantStakingAddress] = rewards[merchantStakingAddress].add(rewardMerchantFee);
        if (excludedFromRewards[merchantStakingAddress]) {
            actual[merchantStakingAddress] = actual[merchantStakingAddress].add(_merchantFee);
        }
    }

    function rewardsFromToken(uint256 _actualAmount, bool _deductTransferFee) public view returns (uint256) {
        require(_actualAmount <= ACTUAL_TOTAL, "Amount must be less than supply");
        if (!_deductTransferFee) {
            (uint256 rewardAmount, , , , ) = _getValues(_actualAmount);
            return rewardAmount;
        } else {
            (, uint256 rewardTransferAmount, , , ) = _getValues(_actualAmount);
            return rewardTransferAmount;
        }
    }

    function tokenWithRewards(uint256 _rewardAmount) public view returns (uint256) {
        require(_rewardAmount <= rewardsTotal, "Amount must be less than total rewards");
        uint256 rewardsRate = _getRewardsRate();
        return _rewardAmount.div(rewardsRate);
    }

    function _getValues(uint256 _actualAmount)
        private
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        (uint256 actualTransferAmount, uint256 actualFee) = _getActualValues(_actualAmount);
        uint256 rewardsRate = _getRewardsRate();
        (
            uint256 rewardAmount,
            uint256 rewardTransferAmount,
            uint256 rewardFee
        ) = _getRewardValues(_actualAmount, actualFee, rewardsRate);

        return (rewardAmount, rewardTransferAmount, rewardFee, actualTransferAmount, actualFee);
    }

    function _getActualValues(uint256 _actualAmount) private view returns (uint256, uint256) {
        uint256 actualFee = _getFee(_actualAmount);
        uint256 actualHolderFee = _getHolderFee(actualFee);
        uint256 actualTransferAmount = _actualAmount.sub(actualFee);
        return (actualTransferAmount, actualHolderFee);
    }

    function _getRewardValues(
        uint256 _actualAmount,
        uint256 _actualHolderFee,
        uint256 _rewardsRate
    )
        private
        view
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        uint256 actualFee = _getFee(_actualAmount).mul(_rewardsRate);
        uint256 rewardAmount = _actualAmount.mul(_rewardsRate);
        uint256 rewardTransferAmount = rewardAmount.sub(actualFee);
        uint256 rewardFee = _actualHolderFee.mul(_rewardsRate);
        return (rewardAmount, rewardTransferAmount, rewardFee);
    }

    function _getRewardsRate() private view returns (uint256) {
        (uint256 rewardsSupply, uint256 actualSupply) = _getCurrentSupply();
        return rewardsSupply.div(actualSupply);
    }

    function _getCurrentSupply() private view returns (uint256, uint256) {
        uint256 rewardsSupply = rewardsTotal;
        uint256 actualSupply = ACTUAL_TOTAL;

        for (uint256 i = 0; i < rewardExcluded.length; i++) {
            if (rewards[rewardExcluded[i]] > rewardsSupply || actual[rewardExcluded[i]] > actualSupply) {
                return (rewardsTotal, ACTUAL_TOTAL);
            }

            rewardsSupply = rewardsSupply.sub(rewards[rewardExcluded[i]]);
            actualSupply = actualSupply.sub(actual[rewardExcluded[i]]);
        }

        if (rewardsSupply < rewardsTotal.div(ACTUAL_TOTAL)) {
            return (rewardsTotal, ACTUAL_TOTAL);
        }

        return (rewardsSupply, actualSupply);
    }

    function _getFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(taxPercentage).div(100);
    }

    function _getHolderFee(uint256 _tax) private view returns (uint256) {
        return _tax.mul(holderTaxAlloc).div(totalTaxAlloc);
    }

    function _getMarketingFee(uint256 _tax) private view returns (uint256) {
        return _tax.mul(marketingTaxAlloc).div(totalTaxAlloc);
    }

    function _getLpFee(uint256 _tax) private view returns (uint256) {
        return _tax.mul(lpTaxAlloc).div(totalTaxAlloc);
    }

    function _getMerchantFee(uint256 _tax) private view returns (uint256) {
        return _tax.mul(merchantTaxAlloc).div(totalTaxAlloc);
    }

    function setTaxPercentage(uint256 _taxPercentage) external onlyOwner {
        require(_taxPercentage >= 1 && _taxPercentage <= 10, "Value is outside of range 1-10");
        taxPercentage = _taxPercentage;
    }

    function setTaxAllocations(
        uint256 _holderTaxAlloc,
        uint256 _marketingTaxAlloc,
        uint256 _lpTaxAlloc,
        uint256 _merchantTaxAlloc
    ) external onlyOwner {
        totalTaxAlloc = _holderTaxAlloc.add(_marketingTaxAlloc).add(_lpTaxAlloc).add(_merchantTaxAlloc);

        require(_holderTaxAlloc >= 5 && _holderTaxAlloc <= 10, "_holderTaxAlloc is outside of range 5-10");
        require(_lpTaxAlloc >= 5 && _lpTaxAlloc <= 10, "_lpTaxAlloc is outside of range 5-10");
        require(_marketingTaxAlloc <= 10, "_marketingTaxAlloc is greater than 10");
        require(_merchantTaxAlloc <= 10, "_merchantTaxAlloc is greater than 10");

        holderTaxAlloc = _holderTaxAlloc;
        marketingTaxAlloc = _marketingTaxAlloc;
        lpTaxAlloc = _lpTaxAlloc;
        merchantTaxAlloc = _merchantTaxAlloc;
    }

    function setMarketingAddress(address _marketingAddress) external onlyOwner {
        marketingAddress = _marketingAddress;
    }

    function setLpStakingAddress(address _lpStakingAddress) external onlyOwner {
        lpStakingAddress = _lpStakingAddress;
    }

    function setMerchantStakingAddress(address _merchantStakingAddress) external onlyOwner {
        merchantStakingAddress = _merchantStakingAddress;
    }
}

{
  "compilationTarget": {
    "contracts/WorldFarm.sol": "WorldFarm"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}