Clutch and electronic calculator: what they have in common

1. Step 1. Clutch — is part of — Motorcycle. A clutch between the engine and the gearbox.
2. Step 2. Motorcycle — has part — Wheel. A motorcycle has two wheels, like a bicycle.
3. Step 3. Wheel — is part of — Lunokhod. Wheels.
4. Step 4. Lunokhod — has part — Solar panel. A solar panel.
5. Step 5. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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