Camshaft and radar: what they have in common

1. Step 1. Camshaft — is part of — Internal combustion engine. The camshaft opens the engine’s valves.
2. Step 2. Internal combustion engine — includes — Turbojet engine. A jet engine is also an internal combustion engine: fuel burns inside, but a gas jet pushes the plane.
3. Step 3. Turbojet engine — is part of — Jet fighter. A turbojet.
4. Step 4. Jet fighter — has part — Radar. A radar.

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