{HEAD ~ The trunking} comprises an elongate channel member and {TAIL ~ an elongate cover member} dimensioned and arranged releasably to engage and close the channel member 
comprises
{ HEAD ~ The trunking } comprises an elongate channel member and { TAIL ~ an elongate cover member } dimensioned and arranged releasably to engage and close the channel member
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH