The apparatus 17, wherein {HEAD ~ the program code} is configured to identify a set of {TAIL ~ values} that potentially satisfy the query by: 
The apparatus 17 , wherein { HEAD ~ the program code } is configured to identify a set of { TAIL ~ values } that potentially satisfy the query by :
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH