stacking the plurality of {HEAD ~ base sheets} together with {TAIL ~ their interior edges} aligned with each other, the aligned edges defining and being exposed on the walls of a cavity 
together with
stacking the plurality of { HEAD ~ base sheets } together with { TAIL ~ their interior edges } aligned with each other , the aligned edges defining and being exposed on the walls of a cavity
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH