{HEAD ~ A memory bus} 408 may be used for communicating between processor 404 and {TAIL ~ system memory} 406 
used for communicating between
{ HEAD ~ A memory bus } 408 may be used for communicating between processor 404 and { TAIL ~ system memory } 406
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH