In embodiment 20, the current address is a random number from a pseudo random generator 22; in the other embodiment 30, the current address is the number stored at {HEAD ~ a specific memory location} in {TAIL ~ memory} 32 
In embodiment 20 , the current address is a random number from a pseudo random generator 22 ; in the other embodiment 30 , the current address is the number stored at { HEAD ~ a specific memory location } in { TAIL ~ memory } 32
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH