Refrigerator and personal computer: what they have in common

1. Step 1. Refrigerator — is used in — Supermarket. Refrigerated displays.
2. Step 2. Supermarket — uses — Cash register. Tills.
3. Step 3. Cash register — has part — Keyboard. Sums were entered with keys.
4. Step 4. Keyboard — is part of — Personal computer. A keyboard.

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