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  1. or download this
    use Ensure;
    use strict;
    ...
    };
    
    print "Finally stopped at $x.\n";
    
  2. or download this
    while ($x < $limit) {
      print "Enter P,Q,R: ";
    ...
      last if $x >= $limit;
      $x /= $r;
    }
    
  3. or download this
    ensure { ... } using($x,$y,$z), looping { ... };
    
    ensure { ... } using($x,\@y), looping { ... };
    
    ensure { ... } using($x,\%y,\@z), looping { ... };
    
  4. or download this
    package Ensure;
    
    ...
    
    
    1;