040000 tree 636187d7124f6c54ff96653d9760596cf71cd01a	concepts.callable
040000 tree ee1c7e9bcc45b956be90b4a0b015b5a1771cc07a	concepts.compare
040000 tree 543de2dd3dcb581a514876d004bf4362e0a3ab30	concepts.lang
040000 tree ed64263f489aefcc97009d686d76bbb5459e9039	concepts.object