Scooter step-through body and solar panel: what they have in common

1. Step 1. Scooter step-through body — is part of — Motor scooter. A leg shield and floor.
2. Step 2. Motor scooter — has part — Wheel. Small-diameter wheels.
3. Step 3. Wheel — is part of — Lunokhod. Wheels.
4. Step 4. Lunokhod — has part — Solar panel. A solar panel.

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