Electronic calculator and car: what they have in common

1. Step 1. Electronic calculator — has part — Alkaline battery. A calculator runs on a battery, sometimes on a tiny solar panel.
2. Step 2. Alkaline battery — is made of — Electrolyte. The electrolyte is potassium hydroxide.
3. Step 3. Electrolyte — is material for — Car battery. Sulfuric acid is the electrolyte.
4. Step 4. Car battery — is part of — Car. A battery.

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