Video call and smart meter: what they have in common

1. Step 1. Video call — uses — Webcam. A webcam.
2. Step 2. Webcam — is part of — Laptop. Above the screen is a small webcam for video calls.
3. Step 3. Laptop — has part — Liquid-crystal display. An LCD screen.
4. Step 4. Liquid-crystal display — is part of — Smart meter. A display.

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