Separator diaphragm and saw: what they have in common

1. Step 1. Separator diaphragm — is part of — Electrolyser. It separates hydrogen and oxygen.
2. Step 2. Electrolyser — is made of — Nickel. The electrodes are nickel.
3. Step 3. Nickel — is material for — Spark plug. The electrodes are a nickel alloy.
4. Step 4. Spark plug — is part of — Internal combustion engine. A petrol engine ignites the mixture with a spark plug.
5. Step 5. Internal combustion engine — is part of — Chainsaw. A two-stroke engine.
6. Step 6. Chainsaw — evolved from — Saw. A mechanized saw.

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