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