Formwork and liquid-propellant rocket engine: what they have in common

1. Step 1. Formwork — is used in — Concrete. Poured into formwork.
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 — evolved into — Liquid-propellant rocket engine. Goddard switched to liquid fuel.

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