Morse code and refrigerator: what they have in common

1. Step 1. Morse code — works like — Binary number system. A code of two kinds of signal — dots and dashes.
2. Step 2. Binary number system — is used in — Barcode. The bars encode digits.
3. Step 3. Barcode — is used in — Supermarket. Barcodes.
4. Step 4. Supermarket — uses — Refrigerator. Refrigerated displays.

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