Supermarket and diesel engine: what they have in common

1. Step 1. Supermarket — uses — Refrigerator. Refrigerated displays.
2. Step 2. Refrigerator — has part — Compressor. A compressor with an electric motor.
3. Step 3. Compressor — is part of — Turbocharger. A compressor.
4. Step 4. Turbocharger — is part of — Diesel engine. Modern diesels are turbocharged.

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