040000 tree 1a6ffed777ad71858d6ac04942bf066aae874f26	concepts.callable
040000 tree 89c8a943ea4ad94d1255f62aa672523ec3ca9b51	concepts.compare
040000 tree f64fd355a0ea15f4b6eea87e1f3f37bd7d7a9a61	concepts.lang
040000 tree d031348c16a729277e8296f117af9e5eb55bda3e	concepts.object