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my $filename_mh_sc_8_qnt = 'mh_science_8_qnt.txt';
open my $mh_sc_8_qnt, '<', $filename_mh_sc_8_qnt or die "Cannot open '
+$filename_mh_sc_8_qnt' for reading: $!";
      
...
        $counter++;
    };
print "\n";