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        +            $step+         $step   +      $step      +
           $Co$W    $S    $Co$W    $S    $Co$W    $S    $Co$W
...
     $W     $L        $W     $L        $W     $L        $W
                                                          
    +                 +                 +                 +
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        #!/usr/bin/perl
    
...
                     $j               $j               $j 
               $W   $pos    $W      $pos $W         $p$W  
    +                 +                 +                 +