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Here are the missing phrases filled into the description: The six-stroke internal combustion engine – a new invention Four-stroke internal-combustion engines waste a lot of heat. Here is my idea for a new invention (D) and converts it into more energy. My new invention is the six-stroke engine. It’s based (J) on the normal four-stroke engine, but it has two extra strokes and one extra (G) valve. What do you think comes into the engine through this valve? It’s water! After the exhaust gases flow out of

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