Chassis frame and rocket: what they have in common

1. Step 1. Chassis frame — is part of — Truck. A body-on-frame design.
2. Step 2. Truck — is part of — Multiple rocket launcher. On a truck chassis.
3. Step 3. Multiple rocket launcher — uses — Solid rocket motor. Rockets.
4. Step 4. Solid rocket motor — evolved from — Rocket. Gunpowder rockets.

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