Liquid-crystal display and air conditioner: what they have in common

1. Step 1. Liquid-crystal display — is part of — Electronic calculator. An LCD display.
2. Step 2. Electronic calculator — has part — Integrated circuit. A chip.
3. Step 3. Integrated circuit — uses — Cleanroom. Production in cleanrooms.
4. Step 4. Cleanroom — uses — Air conditioner. Air filtration.

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