{TAIL ~ Retention channel} 915 extends substantially the entire length along each edge of {HEAD ~ each part} receiving area 910 
{ TAIL ~ Retention channel } 915 extends substantially the entire length along each edge of { HEAD ~ each part } receiving area 910
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH