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function pack_uint8x16(uint8[] memory array) internal pure returns (bytes32 packed);
function unpack_uint8x16(bytes32 packed) internal pure returns (uint8[] memory array);
function pack_uint64x4(uint64[] memory array) internal pure returns (bytes32 packed);
function unpack_uint64x4(bytes32 packed) internal pure returns (uint64[] memory array);
function pack_uint64x16(uint64[] memory array) internal pure returns (bytes32 p0, bytes32 p1, bytes32 p2, bytes32 p3);
function unpack_uint64x16(bytes32 p0, bytes32 p1, bytes32 p2, bytes32 p3)
internal
pure
returns (uint64[] memory array);
function _pack4(uint64[] memory a, uint256 offset) private pure returns (bytes32 out);
function _unpack4(bytes32 b, uint64[] memory a, uint256 offset) private pure;