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foreach my $samekeys (sort keys %hash1) { if (exists $hash2{$samekeys}){ ... } } }
1 2 3 4 5 6 Line 1234567890 1234567890 1234567890 1234567890 1234567890 1234567890 1 GGAAAAACAT TTCATCTTAA AACTTTCCTA AGACAAGGGA AAACAAAAAA CCATGCTCTA ... etc.