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#!/usr/bin/perl -w ... 002902 19990223 101172
20000229 (y 2000 m 2 d 29) yep 19970229 nope ... 002902 (y 1900 m 2 d 29) yep 19990223 (y 1999 m 2 d 23) yep 101172 (y 1972 m 10 d 11) yep