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