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