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for ( $ipaddress, $prefix, $interface, $device, $location, $comment )
{
...
  ## That one is quite nice.
  ## Let's just say there's more than one way to do it.
}

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STRING: for( $ipaddress, $prefix, $interface, $device, $location, $com
+ment )
{
  next STRING unless defined; # We skip any element that is not define
+d
  s/^\s+|\s+$//g;
}