{HEAD ~ The workpiece} may be a single piece of material or {TAIL ~ a plurality} of pieces of material which are bonded together under the influence of heat and pressure 
be
{ HEAD ~ The workpiece } may be a single piece of material or { TAIL ~ a plurality } of pieces of material which are bonded together under the influence of heat and pressure
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH