Armoured car and atomic clock: what they have in common

1. Step 1. Armoured car — evolved from — Car. A car with armour.
2. Step 2. Car — includes — Self-driving car. A self-driving car is an ordinary car driven by a computer with cameras and sensors.
3. Step 3. Self-driving car — has part — GPS (satellite navigation). Satellite navigation.
4. Step 4. GPS (satellite navigation) — uses — Atomic clock. The satellites carry atomic clocks; the position is calculated from signal arrival times.

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