{HEAD ~ The trunking} may also include {TAIL ~ a cable retainer} for retaining cable and the like in the channel member 
include
{ HEAD ~ The trunking } may also include { TAIL ~ a cable retainer } for retaining cable and the like in the channel member
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH