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      int main (argc, argv)
         int argc,
         char *argv[]
      {
           return 0;
      }

      MyFunc ( -type  => qw ( lemur llama lynx ),
               -width => 150 );

       sub MyFunc ($$\$)
       {
             my ($x, $y, $z) = @_;
             # $x and $y are required, $z optional.
       }