{HEAD ~ A first plurality} of ventilation apertures are formed in the substrate and the metallic material, and the first plurality of ventilation apertures are configured to permit a fluid to pass through the substrate and {TAIL ~ the metallic material} 
{ HEAD ~ A first plurality } of ventilation apertures are formed in the substrate and the metallic material , and the first plurality of ventilation apertures are configured to permit a fluid to pass through the substrate and { TAIL ~ the metallic material }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL