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040000 tree 819202870b283f5c8a13582e0da9f07e1638aeb0	23_containers
040000 tree 9abb8b0a2d7419d6b6e566d8ffe3e0c397a8f3f4	25_algorithms
040000 tree ade655f3151540167db0f15fe520795eca68700a	26_numerics
040000 tree 1c9e5d3629a53f7302dbcc9a91f16d85706dd90c	27_io
040000 tree cb15ceca458e46ce529f47f6c2f4218cb9faf487	28_regex
040000 tree 9112a7aa80f90fa8b0250547d5ec189a7a09a508	30_threads
040000 tree 4013da32c4db2ce66fafdb8c62771992eddc8f9a	ext