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