Carriage and multistage rocket: what they have in common

1. Step 1. Carriage — has part — Leaf spring. Leaf springs softened the ride of carriages.
2. Step 2. Leaf spring — is part of — Truck. Leaf-spring suspension.
3. Step 3. Truck — is part of — Multiple rocket launcher. On a truck chassis.
4. Step 4. Multiple rocket launcher — uses — Solid rocket motor. Rockets.
5. Step 5. Solid rocket motor — is part of — Intercontinental ballistic missile. Solid-fuel ICBMs.
6. Step 6. Intercontinental ballistic missile — is a kind of — Multistage rocket. A multistage rocket.

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