{HEAD ~ A displacement mechanism} which relocates {TAIL ~ acceptable pieces} to avoid excessive trim is labeled as B 
relocates
{ HEAD ~ A displacement mechanism } which relocates { TAIL ~ acceptable pieces } to avoid excessive trim is labeled as B
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH