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