Sidecar motorcycle and electronic calculator: what they have in common

1. Step 1. Sidecar motorcycle — has part — Wheel. A third wheel.
2. Step 2. Wheel — is part of — Lunokhod. Wheels.
3. Step 3. Lunokhod — has part — Solar panel. A solar panel.
4. Step 4. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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