040000 tree 8022f5e1b49e713d862a67363e90f372021035f6	istream.formatted.arithmetic
040000 tree b43f40f7428c5f6d116709938869e52b519c89c9	istream.formatted.reqmts
040000 tree 2e641b40382a912a8dfe8e0cb390704e8925823c	istream_extractors