Television and programmable logic controller: what they have in common

1. Step 1. Television — is used in — Television set. It receives television.
2. Step 2. Television set — has part — Remote control. A remote control.
3. Step 3. Remote control — has part — LED. An infrared LED.
4. Step 4. LED — is part of — Traffic light. LEDs.
5. Step 5. Traffic light — has part — Relay. Relay controllers.
6. Step 6. Relay — evolved into — Programmable logic controller. It replaced relay cabinets.

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