Zener diode and gas lamp: what they have in common

1. Step 1. Zener diode — is a kind of — Diode. A diode.
2. Step 2. Diode — includes — LED. A light-emitting diode.
3. Step 3. LED — is part of — Street light. LEDs.
4. Step 4. Street light — evolved from — Gas lamp. Gas lamps.

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