{HEAD ~ The cover} has {TAIL ~ a longitudinal extended V} shaped protuberance along a face of the cover which engages the base member 
has
{ HEAD ~ The cover } has { TAIL ~ a longitudinal extended V } shaped protuberance along a face of the cover which engages the base member
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH