Container ship and hammer: what they have in common

1. Step 1. Container ship — has part — Diesel engine. A slow-speed diesel.
2. Step 2. Diesel engine — has part — Cylinder. 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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