Channels 44 accommodate webs 30 and open portions 46 accommodate {HEAD ~ first and second ends} 26 and 28 of {TAIL ~ the grid} 20 
of
Channels 44 accommodate webs 30 and open portions 46 accommodate { HEAD ~ first and second ends } 26 and 28 of { TAIL ~ the grid } 20
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH