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