Reduction gear and turbojet engine: what they have in common

1. Step 1. Reduction gear — is part of — Turboprop. A propeller gearbox.
2. Step 2. Turboprop — is a kind of — Gas turbine. A gas turbine.
3. Step 3. Gas turbine — includes — Turbojet engine. A turbojet is a gas turbine that produces thrust with a jet.

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