{HEAD ~ An edge coating} of polymer or other material is disposed on and seals the interior edge of {TAIL ~ the base sheet} and may project beyond the facial planes of the base sheet to define protruding rims extending around the aperture 
{ HEAD ~ An edge coating } of polymer or other material is disposed on and seals the interior edge of { TAIL ~ the base sheet } and may project beyond the facial planes of the base sheet to define protruding rims extending around the aperture
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