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