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