A search key can be compared to {TAIL ~ the differentiating values} to determine {HEAD ~ which entry} is most likely to match 
A search key can be compared to { TAIL ~ the differentiating values } to determine { HEAD ~ which entry } is most likely to match
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH