040000 tree 8e2014b46936d3fc8e7547add1a2efa9ac1c3b80	21_strings
040000 tree bf56b9d841e2c9e66d759e755c486e0d97108343	22_locale
040000 tree 58a7040c980751e23e6cc897db89b9da10b6bf6b	23_containers
040000 tree 976d3d7de39e636c7e1ec78735933c1ba03b771a	25_algorithms
040000 tree 0c65c014544944414c0747b24fde7f84ffe34fc8	26_numerics
040000 tree 205fc2cd3c457c4bd9fab480cb7a457b2128ff00	27_io
040000 tree 34f12b31eb1900fea8e796bbcc1ff46e8c993c9b	30_threads
040000 tree c18f0887f52740ed99572cd047f6dffdb1328344	ext