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