{HEAD ~ An operating condition sensor} detects {TAIL ~ the engine operating condition}; and a control device regulates the amount of fuel injected by the fuel injection valve, the injection timing and the ignition timing of the spark plug based on the detected operating condition 
detects
{ HEAD ~ An operating condition sensor } detects { TAIL ~ the engine operating condition } ; and a control device regulates the amount of fuel injected by the fuel injection valve , the injection timing and the ignition timing of the spark plug based on the detected operating condition
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