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  1. or download this
    ./23file.pm: open: not found
./23file.pm: open: not found
./23file.pm: open: not found
./23file.pm: syntax error at line 4: `)' unexpected
  2. or download this
    open MASTER, "file3" or die "cant't open master file: $!\n";
open SUBSET, "file2" or die "can't open subset file: $!\n";
...
close SUBSET;
close MASTER;
close OUT or die "couldn't close outfile: $!\n";