Vehicle and turbojet engine: what they have in common

1. Step 1. Vehicle — includes — Aircraft. Aircraft are a kind of transport.
2. Step 2. Aircraft — includes — Helicopter. An aircraft.
3. Step 3. Helicopter — has part — Gas turbine. A turboshaft engine.
4. Step 4. Gas turbine — includes — Turbojet engine. A turbojet is a gas turbine that produces thrust with a jet.

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