The cable holder has two side walls and {HEAD ~ a bottom wall}, with {TAIL ~ grooves} at the tops of the side walls 
with
The cable holder has two side walls and { HEAD ~ a bottom wall } , with { TAIL ~ grooves } at the tops of the side walls
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH