Solid rocket motor and refrigerator: what they have in common

1. Step 1. Solid rocket motor — is used in — Multiple rocket launcher. Rockets.
2. Step 2. Multiple rocket launcher — has part — Truck. On a truck chassis.
3. Step 3. Truck — has part — Air brake. Air brakes, as on trains.
4. Step 4. Air brake — has part — Compressor. A compressor pumps the air.
5. Step 5. Compressor — is part of — Refrigerator. A compressor with an electric motor.

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