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040000 tree 900eabee3db83d3af30a44495db245fd10115984	25_algorithms
040000 tree b1850c4accc91bccd798fbab9a66c37d6adf89ec	26_numerics
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040000 tree acbc9a551e17d750192f93044ba0057e845f2a2f	28_regex
040000 tree 9014b4831d01a8dd716e2c2bdb22c2aa969c4289	30_threads
040000 tree 05e33962ce79481ef270c252c78bd2dc4a452e89	ext