{HEAD ~ The retention channel} extends substantially {TAIL ~ an entire length} along each edge of each part receiving area 
extends substantially
{ HEAD ~ The retention channel } extends substantially { TAIL ~ an entire length } along each edge of each part receiving area
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH