Waterproof outer film and solar panel: what they have in common

1. Step 1. Waterproof outer film — is part of — Disposable nappy. Film.
2. Step 2. Disposable nappy — is made of — Polyethylene. Film.
3. Step 3. Polyethylene — is material for — Skateboard. The wheels are polyurethane.
4. Step 4. Skateboard — has part — Wheel. Four wheels.
5. Step 5. Wheel — is part of — Lunokhod. Wheels.
6. Step 6. Lunokhod — has part — Solar panel. A solar panel.

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