Levee and shaduf: what they have in common

1. Step 1. Levee — evolved into — Dam. A retaining structure.
2. Step 2. Dam — is made of — Reinforced concrete. Concrete dams.
3. Step 3. Reinforced concrete — is material for — Skyscraper. Reinforced concrete.
4. Step 4. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.
5. Step 5. Elevator — uses — Counterweight. A counterweight balances the car.
6. Step 6. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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