The routine at 204 may include adjusting the second turbine to increase/decrease expansion across {HEAD ~ the second turbine} in response to a request for {TAIL ~ increased/decreased, respectively, engine output} 
The routine at 204 may include adjusting the second turbine to increase / decrease expansion across { HEAD ~ the second turbine } in response to a request for { TAIL ~ increased / decreased , respectively , engine output }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL