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open D1, 'data1.txt'; open D2, 'data2.txt'; ... } close D2; close D1;
>seq1 GGTacacagaagccaaagcaggctccaggctctgagctgtcagcacagagaccgaT >seq2 GTCTCTGTCTCtaaaataaataaacattaaaaaaattttaaaagaaaaGATTCTCTCC