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  1. or download this
    perl -e '
    for $n(10..14) {
      $str = "x"x($n*2+1); 
    ...
    $str:xxxxxxxxxxxxxxxxxxxxxxxxx n:12 time:9sec
    $str:xxxxxxxxxxxxxxxxxxxxxxxxxxx n:13 time:39sec
    $str:xxxxxxxxxxxxxxxxxxxxxxxxxxxxx n:14 time:156sec
    
  2. or download this
    perl -e '
    for $n(1..14) {
      $str = "x"x($n*3+1); 
    ...
    $str:xxxxxxxxxxxxxxxxxxxxxxxxxxxx n:9 time:73sec
    $str:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx n:10 time:555sec
    ^C