040000 tree 636187d7124f6c54ff96653d9760596cf71cd01a	concepts.callable
040000 tree ae26bba0358ab2b0e3e0388ac65614198799c70b	concepts.compare
040000 tree e6d34291aacc9971ceefd62883fdcfe9baeefbc6	concepts.lang
040000 tree 01a4fdd0c65b00d557313bbd75b07d83cda7cd4f	concepts.object