{HEAD ~ logic} coupled to {TAIL ~ the differentiating register} to determine which entry is most likely to match a search key and 
{ HEAD ~ logic } coupled to { TAIL ~ the differentiating register } to determine which entry is most likely to match a search key and
HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH