In {HEAD ~ one arrangement}, each channel section can include a flange along both sides thereof, the connection mechanism being provided on {TAIL ~ each flange} 
In { HEAD ~ one arrangement } , each channel section can include a flange along both sides thereof , the connection mechanism being provided on { TAIL ~ each flange }
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL