040000 tree d90e4b63b0622008da0870c727af3a480e22a9a9	20_util
040000 tree 42564d6d427601b0da0ee1cde976635023be59b0	21_strings
040000 tree 237e2b29f186adad1861bb438a731d0edf8764de	22_locale
040000 tree 884c2901495ae3a45db718ad04df65f11856bc50	23_containers
040000 tree 00caf736812666d6c14e7d64a34dbdc376d02776	25_algorithms
040000 tree a2e67294c358192591b9cdd390b611cd424373c1	26_numerics
040000 tree ac1278c584d4a0d906ae7b72db551fb2f1af2442	27_io
040000 tree 21e4bc1ee98fc83174de18d772f6d541cd2568f2	28_regex
040000 tree ec437dccc4376427f98c9c5b55bd42847ce2b9ae	29_atomics
040000 tree dd72989776b58d73a32aa15ecf8f34f7c53b29f5	30_threads
040000 tree 3af5f802c6416bfcbf5014f47e0bb4ccc3064dcb	ext