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