{TAIL ~ The ends} of {HEAD ~ the channel} and the corresponding end caps may be either square or slanted 
{ TAIL ~ The ends } of { HEAD ~ the channel } and the corresponding end caps may be either square or slanted
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH