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