Typewriter and freezer: what they have in common

1. Step 1. Typewriter — has part — Keyboard. The keys drive levers with type.
2. Step 2. Keyboard — is part of — Cash register. Sums were entered with keys.
3. Step 3. Cash register — is used in — Supermarket. Tills.
4. Step 4. Supermarket — uses — Refrigerator. Refrigerated displays.
5. Step 5. Refrigerator — includes — Freezer. A refrigeration appliance.

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