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$a=$a ^ $b;
$b=$a ^ $b;
...
$b=$b ^ $c;
$c=$b ^ $c;
$b=$b ^ $c;

  $b=$b^$c;
  $a=$a^$c;
...
  $a=$a^$b;
  $a=$a^$c;
  $b=$a^$b;