{HEAD ~ A control module} 18 communicates with {TAIL ~ the engine} 12, the transmission 14 and a power take off unit 20  
communicates with
{ HEAD ~ A control module } 18 communicates with { TAIL ~ the engine } 12 , the transmission 14 and a power take off unit 20
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH