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