Other circuitry is coupled to {HEAD ~ system bus} 12 such as {TAIL ~ memory} 17 
such as
Other circuitry is coupled to { HEAD ~ system bus } 12 such as { TAIL ~ memory } 17
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH