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Cylinder is to Lock as Engine to?

This is a classic analogy puzzle! The answer is Car.

Here's why:

* Cylinder is a key component of a lock. The cylinder holds the pins and tumblers that allow the key to operate the lock.

* Engine is a key component of a car. The engine provides the power that allows the car to move.

Both analogies highlight the essential role of the first term in the functioning of the second.