my $dna=();
 foreach my $dna (@random_DNA) { # Line 19 
   print"$dna\n";}  
 print"\n";# one per line Line 21
my $output="RandDNA .txt";
unless (open(RESULT,">my $output")){
print"Cannot open file\"my $output\".\n\n";
exit;
}  # Line 26  
print RESULT"\n Randomly Generated dna:\n
 The DNA set containing $number molecules varying in length from $minl to $maxl bases are:\n\n
 my $dna\n";