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