++  $2++
                  $1++++++  $2++++++
               $1+++++++++  $2+++++++++
               $1+++++++      $2+++++++
        $1+++  $2+++  $1+  $3--------$1  $2+  $1+++  $2+++
     $1++++++  $2++++++   $3------$1   ++++++  $2++++++
   $1++++++++  $2++++++++++    $1++++++++++  $2++++++++
  $1+++++++  $3--$1  $2+++++++      $1+++++++  $3--$1  $2+++++++
$2+++  $1+  $3--------$1  $2+  $1+++  $2+++  $1+  $3--------$1  $2+  $1+++
$2++++++  $3--------$1  ++++++  $2++++++  $3--------$1  ++++++
$2++++++++++     $1+++++++++  $2+++++++++     $1++++++++++
  $2+++++++++    $1+++++++  $3--$1  $2+++++++    $1+++++++++
      $2+++++  +++     $3--------$1     +++  +++++
         $2++  +++++++  $3------$1  +++++++  ++
             $2++++++++++    $1++++++++++
                $2++++++++  $1++++++++
                   $2+++++  $1+++++
                      $2++  $1++