{HEAD ~ Each L shaped leg} 34 includes a transversely extending lip 38 with a keying arrangement in {TAIL ~ the form} of a plurality of slots 40 formed therein 
{ HEAD ~ Each L shaped leg } 34 includes a transversely extending lip 38 with a keying arrangement in { TAIL ~ the form } of a plurality of slots 40 formed therein
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH