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  1. or download this
    if($par{'margin-left'} ne 'a'){
  $actual = $par{'margin-left'}
...
  $actual = $par{'margin-horizontal'}
}
else{$actual = $par{'margin'}}
  2. or download this
    $actual = $par{'margin-left'} // $par{'margin-horizontal'} // $par{'ma
+rgin'};