Launch complex and tank: what they have in common

1. Step 1. Launch complex — uses — Rocket. Launching rockets.
2. Step 2. Rocket — uses — Reaction force. A rocket moves by reaction force.
3. Step 3. Reaction force — is used in — Machine gun. Recoil energy reloads the weapon.
4. Step 4. Machine gun — is part of — Tank. The Mark I’s machine guns.

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