Helium and turbojet engine: what they have in common

1. Step 1. Helium — is used in — Airship. After the Hindenburg — helium.
2. Step 2. Airship — has part — Internal combustion engine. Internal combustion engines.
3. Step 3. 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.

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