ATM and smart meter: what they have in common

1. Step 1. ATM — has part — Keyboard. A PIN pad.
2. Step 2. Keyboard — is part of — Laptop. The keyboard is built into the laptop's case.
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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