Motor scooter and electric motor: what they have in common

1. Step 1. Motor scooter — is a kind of — Motorcycle. A motorcycle.
2. Step 2. Motorcycle — has part — Pneumatic tyre. Pneumatic tyres on both wheels.
3. Step 3. Pneumatic tyre — is part of — Trolleybus. Runs on tyres.
4. Step 4. Trolleybus — has part — Electric motor. An electric motor.

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