a bypass path bypassing {TAIL ~ exhaust gas} from {HEAD ~ an upstream side} of the turbine of the high pressure supercharger to a downstream side of the turbine; and 
a bypass path bypassing { TAIL ~ exhaust gas } from { HEAD ~ an upstream side } of the turbine of the high pressure supercharger to a downstream side of the turbine ; and
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH