It should be understood that {HEAD ~ the multiple bus masters} may be connected to {TAIL ~ system bus} by other buses or directly 
connected to
It should be understood that { HEAD ~ the multiple bus masters } may be connected to { TAIL ~ system bus } by other buses or directly
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH