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sub createcircle {
   my ($foo, $bar) = @_;
...
   $qux = sub { $quux->(shift - 1) };
   return $quux;
}

$;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/