Basketball rim and electric motor: what they have in common

1. Step 1. Basketball rim — is part of — Basketball hoop. A steel ring.
2. Step 2. Basketball hoop — uses — Ball. A ball.
3. Step 3. Ball — has part — Inner tube. A chamber with air.
4. Step 4. Inner tube — is part of — Pneumatic tyre. Tube-type tyres.
5. Step 5. Pneumatic tyre — is part of — Trolleybus. Runs on tyres.
6. Step 6. Trolleybus — has part — Electric motor. An electric motor.

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