040000 tree 636187d7124f6c54ff96653d9760596cf71cd01a	concepts.callable
040000 tree ee1c7e9bcc45b956be90b4a0b015b5a1771cc07a	concepts.compare
040000 tree ff6d8da3524202d3a3bd7fd50e9fc5e8a1c60759	concepts.lang
040000 tree ed64263f489aefcc97009d686d76bbb5459e9039	concepts.object