040000 tree d6a9aa1cc71f7539352ee994055739819ffd5d5b	concepts.callable
040000 tree d4c5f01fb4f85c3d4539732a3b623b04bab582af	concepts.compare
040000 tree 895ad47271cccf15db53128c08c2fd6e84c020e5	concepts.lang
040000 tree ca6b7efe611a746d8d5a924134740205e7df86f0	concepts.object