Another set of embodiments utilizes memory storage media capable of confining propagating waves in {HEAD ~ order} to implement {TAIL ~ the memory devices} 
Another set of embodiments utilizes memory storage media capable of confining propagating waves in { HEAD ~ order } to implement { TAIL ~ the memory devices }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL