Each channel section may include {TAIL ~ a flange} along {HEAD ~ at least one side} thereof, the connection mechanism being provided on the flange 
Each channel section may include { TAIL ~ a flange } along { HEAD ~ at least one side } thereof , the connection mechanism being provided on the flange
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH