Motorcycle and electric generator: what they have in common

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

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