interface IERC20Burnable {
    function burn(uint256 amount) external returns (bool);
    function burnFrom(address account, uint256 amount) external returns (bool);
    // ERC20
    function totalSupply() external view returns (uint256);
    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 totalSupply() external view returns (uint256);

// ERC20