040000 tree c8f13f4ef64e995bb6f0ab240c42fcdfe683d9b4	concepts.callable
040000 tree cdf25e1e294bd4332c286230e11724844deeb652	concepts.compare
040000 tree ae2ee3e444adc6b1cc4db48323d61de8ae8f2b49	concepts.lang
040000 tree d031348c16a729277e8296f117af9e5eb55bda3e	concepts.object