Silicon solar cell and windlass: what they have in common

1. Step 1. Silicon solar cell — is part of — Solar panel. A silicon wafer with a p–n junction.
2. Step 2. Solar panel — is part of — Lunokhod. A solar panel.
3. Step 3. Lunokhod — has part — Wheel. Wheels.
4. Step 4. Wheel — is used in — Windlass. A windlass is a wheel and axle used as a simple machine.

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