040000 tree 9609e48a926248c620235a955736a2567e85d3c1	20_util
040000 tree 29e3b3e3b1b724111e92f28fc4b9c328c40722b3	21_strings
040000 tree 794b80e1cb8492178695ba14cfbec6ab51a17bfc	22_locale
040000 tree 1438dc7525fe282ae2f8a787c4823fb02441c84e	23_containers
040000 tree e2ee36e99dc4e3a9834ff2da979ed9142dafa616	25_algorithms
040000 tree 31f972282e71b8b8aa799899e3044963a675308c	26_numerics
040000 tree 56aee804e00e65ae7affdaf1fdfd8aeeae22e4d6	27_io
040000 tree 29850276fa824536f7f040b34b4efd2db3c1e9cc	28_regex
040000 tree f2091af40272a7e458136802b3041b4516e9c1d3	29_atomics
040000 tree f99e572e8414e3065f999cd91cea6457c5607c87	30_threads
040000 tree c443b76096366fdd5bc46e19333da57a0557fa12	ext