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An in-line engine is a type of internal combustion engine where the cylinders are arranged in one or more parallel straight lines. This design contrasts with other configurations like V-engines or radial engines. In-line engines are a common type of piston-and-cylinder engine, where combustion creates pressure on a piston, causing it to move back and forth within a cylinder to perform work. These engines are widely used, particularly in the automotive and aeronautics industries.123

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