shifting the contents of said plurality of memory locations 2N+1 to 1 to {HEAD ~ respective ones} of {TAIL ~ memory locations} 2N to 0 
of
shifting the contents of said plurality of memory locations 2N+1 to 1 to { HEAD ~ respective ones } of { TAIL ~ memory locations } 2N to 0
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH