Cellular network and gas lamp: what they have in common

1. Step 1. Cellular network — is used in — Smart meter. Data transmission.
2. Step 2. Smart meter — has part — Liquid-crystal display. A display.
3. Step 3. Liquid-crystal display — has part — LED. LED backlighting.
4. Step 4. LED — is part of — Street light. LEDs.
5. Step 5. Street light — evolved from — Gas lamp. Gas lamps.

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