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