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  1. or download this
    use warnings;
    use strict;
    
    ...
      return UNDEF_VAL unless(defined $inherited);
      return $this->FETCH($inherited);
    }
    
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    package main;
    
    ...
    }
    
    sub printParam { print "  $_[0] = $par{$_[0]}\n" }
    
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    Initial values:
      margin = a
    ...
      margin-horizontal = 8
      margin-left = 3
      margin-right = 8