Steam methane reforming and saw: what they have in common

1. Step 1. Steam methane reforming — is used in — Hydrogen. The main way of producing hydrogen.
2. Step 2. Hydrogen — is used in — Airship. Zeppelins were filled with hydrogen.
3. Step 3. Airship — has part — Internal combustion engine. Internal combustion engines.
4. Step 4. Internal combustion engine — is part of — Chainsaw. A two-stroke engine.
5. Step 5. Chainsaw — evolved from — Saw. A mechanized saw.

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