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2010-02-12_aaa,654 2010-02-12_aaa,248 ... 2010-02-14_aaa,169 2010-02-14_ccc,965 2010-02-14_ccc,756
2010-02-12_aaa,902 2010-02-12_bbb,374 ... 2010-02-14_bbb,754 2010-02-14_aaa,169 2010-02-14_ccc,1721
use List::MoreUtils qw(uniq); my @unique = uniq( 1, 2, 3, 4, 4, 5, 6, 5, 7 ); # 1,2,3,4,5,6,7 my $unique = uniq( 1, 2, 3, 4, 4, 5, 6, 5, 7 ); # 7