Rocket tube and data centre: what they have in common

1. Step 1. Rocket tube — is part of — Rocket. The tube in which the charge burns.
2. Step 2. Rocket — is used in — Launch complex. Launching rockets.
3. Step 3. Launch complex — is made of — Concrete. The launch table is concrete.
4. Step 4. Concrete — is material for — Data centre. The building is concrete.

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