Steel frame and nuclear reactor: what they have in common

1. Step 1. Steel frame — is part of — Skyscraper. A steel frame.
2. Step 2. Skyscraper — has part — Foundation. A deep foundation.
3. Step 3. Foundation — is made of — Concrete. Concrete.
4. Step 4. Concrete — is material for — Nuclear power plant. The containment is concrete.
5. Step 5. Nuclear power plant — has part — Nuclear reactor. The reactor heats the coolant.

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