{HEAD ~ The hybrid vehicle} 9 wherein said {TAIL ~ two ranges} for the air fuel ratio are a first range for a stoichiometric ratio of air to fuel and a second range for an air to fuel ratio leaner than said first range 
wherein
{ HEAD ~ The hybrid vehicle } 9 wherein said { TAIL ~ two ranges } for the air fuel ratio are a first range for a stoichiometric ratio of air to fuel and a second range for an air to fuel ratio leaner than said first range
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH