Clutch and electric generator: what they have in common

1. Step 1. Clutch — is part of — Motorcycle. A clutch between the engine and the gearbox.
2. Step 2. Motorcycle — evolved from — Bicycle. The first motorcycles were built on the bicycle layout: two wheels in line, a frame, a handlebar.
3. Step 3. Bicycle — has part — Bike light with dynamo. A lamp.
4. Step 4. Bike light with dynamo — has part — Electric generator. A dynamo.

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