One method includes connecting {HEAD ~ first and second buses} in {TAIL ~ first and second systems}, respectively, to form a bus for a new system 
in
One method includes connecting { HEAD ~ first and second buses } in { TAIL ~ first and second systems } , respectively , to form a bus for a new system
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH