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  1. or download this
    use Taint ();
Taint::taint($untrustedvalue);
  2. or download this
    $;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/