{TAIL ~ The channel member} has a base wall and {HEAD ~ first and second opposed side walls} having free, elongate edge regions 
{ TAIL ~ The channel member } has a base wall and { HEAD ~ first and second opposed side walls } having free , elongate edge regions
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH