Planetarium and multistage rocket: what they have in common

1. Step 1. Planetarium — is made of — Concrete. Zeiss’s first dome was thin concrete.
2. Step 2. Concrete — is material for — Launch complex. The launch table is concrete.
3. Step 3. Launch complex — uses — Rocket. Launching rockets.
4. Step 4. Rocket — includes — Multistage rocket. A multistage rocket is a rocket that drops its empty tanks on the way.

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