Solar power station and hammer: what they have in common

1. Step 1. Solar power station — is a kind of — Power station. A power station.
2. Step 2. Power station — includes — Thermal power station. A kind of power station.
3. Step 3. Thermal power station — has part — Boiler. Boilers.
4. Step 4. Boiler — is part of — Steam hammer. A boiler supplies the steam.
5. Step 5. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.

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