| http://www.w3.org/ns/prov#value | - reinafter.In the drawings:FIG. 1 is a schematic view showing a preferred embodiment of this invention.FIG. 2 is a view similar to FIG. 1 showing a modification.Referring to the drawings, the engine 10 has an intake passage 11 for an air-fuel mixture, and a passage 12 for exhaust gases.
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