040000 tree ad3cfc363f9349bf33d157464f84ee8d89484a80	20_util
040000 tree 16cde2b74a7095f0209191db4e32fd2c1f4016bd	21_strings
040000 tree fc606d2086ff29701efd91824004724798b8f6fd	22_locale
040000 tree da1747748eb7557ef2595bcb19b1777d85f93a76	23_containers
040000 tree 34d1b9ec156af3ee371cbb69d492c89e58922bf6	26_numerics
040000 tree 21ad7104a32c9ecf711b32147c96a8d9583c4eed	27_io