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open FILE1,"1.txt" or die "can't open file 1"; open FILE2,"2.txt" or die "can't open file 2"; ... close FILE2; close w1; close w2;
file 1 (1.txt) aqw dfr 34 poilo ggg 98 file 2 (2.txt) qww asd 28 poilo ggg 97
3.txt aqw dfr 34 4.txt qww asd 28