{TAIL ~ Each C shaped channel} 18 includes {HEAD ~ a pair} of opposed generally L shaped legs 34 and an interconnecting portion 36 extending between legs 34 
{ TAIL ~ Each C shaped channel } 18 includes { HEAD ~ a pair } of opposed generally L shaped legs 34 and an interconnecting portion 36 extending between legs 34
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH