J-2 rocket engine and internal combustion engine: what they have in common

1. Step 1. J-2 rocket engine — is part of — Saturn V. Hydrogen engines on the upper stages.
2. Step 2. Saturn V — uses — Hydrogen. Hydrogen stages.
3. Step 3. Hydrogen — is used in — Airship. Zeppelins were filled with hydrogen.
4. Step 4. Airship — has part — Internal combustion engine. Internal combustion engines.

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