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