The memory devices of the present invention can be designed so that {HEAD ~ the memory device} circulates {TAIL ~ data} either through or past fixed portals 
circulates
The memory devices of the present invention can be designed so that { HEAD ~ the memory device } circulates { TAIL ~ data } either through or past fixed portals
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH