Examples of {HEAD ~ algorithms} used to select {TAIL ~ access codes} from memory include a rotating algorithm for sequencing next access codes stored in memory in a predetermined order or sequence which are rotated one after the other 
Examples of { HEAD ~ algorithms } used to select { TAIL ~ access codes } from memory include a rotating algorithm for sequencing next access codes stored in memory in a predetermined order or sequence which are rotated one after the other
OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL 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 OTH OTH OTH OTH