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