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);

    /**
    
    */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
    
    */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
    
    */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
    
    */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
    
    */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
    
    */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
 
 */