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my %sum_of; while (<DATA>) { ... 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_aaa,169 2010-02-14_bbb,754 2010-02-14_ccc,1721