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  1. or download this
    map { $val .= sprintf("%02x",$_) } unpack "CCCCCC", $octetstr;
  2. or download this
    $val .= sprintf("%02x",$_) for unpack "CCCCCC", $octetstr;
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    # result from map is discarded
# side effect: $val is populated
...
# result from die is discarded (if any), print not done
# side effect: well...
print die;