| http://www.w3.org/ns/prov#value | - Auxiliary request3.1 Claim 1 is amended by specifying that both the gas including a reducing agent and the gas including oxygen are formed from the exhaust gas of the engine, and by including the feature:wherein lean air-fuel ratio exhaust gas as oxygen including gas is mixed with rich air-fuel ratio exhaust gas as reducing agent including gas in an interconnecting exhaust passage after the gases
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