interface AuctionLike {
    function vat() external returns (address);
    function cat() external returns (address); // Only flip
    function beg() external returns (uint256);
    function pad() external returns (uint256); // Only flop
    function ttl() external returns (uint256);
    function tau() external returns (uint256);
    function ilk() external returns (bytes32); // Only flip
    function gem() external returns (bytes32); // Only flap/flop
}
function gem() external returns (bytes32); // Only flap/flop

// Only flip