Paved road and boyle’s air pump: what they have in common

1. Step 1. Paved road — is used in — Urban planning. A network of streets.
2. Step 2. Urban planning — uses — Sewerage. Infrastructure.
3. Step 3. Sewerage — is used in — Flush toilet. Draining the waste.
4. Step 4. Flush toilet — has part — Valve. The cistern’s float valve.
5. Step 5. Valve — is part of — Boyle’s air pump. Valves.

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