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  1. or download this
    sub max { my $m;
              for (@_) {
    ...
                $m = $_, next if $m < $_;
              }
              $m }
    
  2. or download this
    __SIG__
    use B;
    printf "You are here %08x\n", unpack "L!", unpack "P4", pack
      "L!", B::svref_2object(sub{})->OUTSIDE;