Programmable logic controller and aeroplane: what they have in common

1. Step 1. Programmable logic controller — is used in — Industrial automation. Controllers.
2. Step 2. Industrial automation — uses — Feedback control. Control.
3. Step 3. Feedback control — is used in — Autopilot. Holding a course by feedback.
4. Step 4. Autopilot — is part of — Jet airliner. An autopilot.
5. Step 5. Jet airliner — evolved from — Aeroplane. A jet aircraft.

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