Match stick and autoclave: what they have in common

1. Step 1. Match stick — is part of — Match. A wooden stick.
2. Step 2. Match — uses — Combustion. Combustion.
3. Step 3. Combustion — is used in — Boiler. The firebox heats the water.
4. Step 4. Boiler — is part of — Autoclave. A steam generator.

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