providing {HEAD ~ a plurality} of {TAIL ~ base sheets} each having opposed faces and at least one interior edge surrounding and defining an aperture 
of
providing { HEAD ~ a plurality } of { TAIL ~ base sheets } each having opposed faces and at least one interior edge surrounding and defining an aperture
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH