The sheet 24 may either be a plain thermoplastic material or {HEAD ~ a thermoplastic material} reinforced with {TAIL ~ fibers} 
reinforced with
The sheet 24 may either be a plain thermoplastic material or { HEAD ~ a thermoplastic material } reinforced with { TAIL ~ fibers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL