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function mint(address _to, uint256 _value) external;
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
function transfer(address _to, uint256 _value) external returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) external returns (bool success);
function balanceOf(address _owner) external view returns (uint256 balance);
function decimals() external view returns (uint8);