In one embodiment of the invention, the processor 502 provides {TAIL ~ the search key} 408 to {HEAD ~ system} 400 
In one embodiment of the invention , the processor 502 provides { TAIL ~ the search key } 408 to { HEAD ~ system } 400
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH