{HEAD ~ a first rotor} which is connected to {TAIL ~ the output shaft} of the internal combustion engine 
is connected to
{ HEAD ~ a first rotor } which is connected to { TAIL ~ the output shaft } of the internal combustion engine
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH