Urban planning and nuclear reactor: what they have in common

1. Step 1. Urban planning — uses — Sewerage. Infrastructure.
2. Step 2. Sewerage — has part — Sewage treatment plant. Treatment plants.
3. Step 3. Sewage treatment plant — is made of — Concrete. The tanks are 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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