Motorcycle sidecar body and elevator: what they have in common

1. Step 1. Motorcycle sidecar body — is part of — Sidecar motorcycle. A side car with a wheel.
2. Step 2. Sidecar motorcycle — has part — Wheel. A third wheel.
3. Step 3. Wheel — is part of — Pulley. A pulley is a wheel with a groove for a rope.
4. Step 4. Pulley — is part of — Elevator. The rope runs over a pulley.

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