{HEAD ~ A first plurality} of {TAIL ~ 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 the metallic material 
of
{ HEAD ~ A first plurality } of { TAIL ~ 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 the metallic material
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