Radiator and hammer: what they have in common

1. Step 1. Radiator — is part of — Internal combustion engine. The cooling system.
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 — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.

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