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