Billboard and diesel engine: what they have in common

1. Step 1. Billboard — has part — LED. LED screens.
2. Step 2. LED — is part of — Bike light with dynamo. An LED.
3. Step 3. Bike light with dynamo — has part — Electric generator. A dynamo.
4. Step 4. Electric generator — is part of — Diesel locomotive. The generator powers the traction motors.
5. Step 5. Diesel locomotive — has part — Diesel engine. The diesel turns a generator.

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