Tandoor and elevator: what they have in common

1. Step 1. Tandoor — is made of — Clay. Clay.
2. Step 2. Clay — is material for — Dam. The core of the dam is clay and earth.
3. Step 3. Dam — is made of — Reinforced concrete. Concrete dams.
4. Step 4. Reinforced concrete — is material for — Skyscraper. Reinforced concrete.
5. Step 5. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.

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