Spark plug and boiler: what they have in common

1. Step 1. Spark plug — is part of — Internal combustion engine. A petrol engine ignites the mixture with a spark plug.
2. Step 2. Internal combustion engine — has part — Cylinder. Combustion takes place in the cylinders.
3. Step 3. Cylinder — is part of — Steam hammer. A steam cylinder.
4. Step 4. Steam hammer — has part — Boiler. A boiler supplies the steam.

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