EnumerableMap.Bytes32ToBytes32Map private _map;
function set(bytes32 key, bytes32 value) public returns (bool);
function remove(bytes32 key) public returns (bool);
function contains(bytes32 key) public view returns (bool);
function length() public view returns (uint256);
function key_at(uint256 index) public view returns (bytes32);
function value_at(uint256 index) public view returns (bytes32);
function tryGet_contains(bytes32 key) public view returns (bool);
function tryGet_value(bytes32 key) public view returns (bytes32);
function get(bytes32 key) public view returns (bytes32);
function _positionOf(bytes32 key) public view returns (uint256);