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          my $numerator;
      my $denominator;
  2. or download this
             if ($indicator eq "SH"){
    $numerator = $last_element;
      }
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          elsif ($indicator eq "SL"){
    $denominator = $last_element;
      }
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          else {
    print "\nError: There has been an unexpected string within the sec
+ond to last element of the array\n";
      }