Flywheel and multistage rocket: what they have in common

1. Step 1. Flywheel — includes — Reaction wheel. A flywheel.
2. Step 2. Reaction wheel — is part of — Artificial satellite. Attitude control.
3. Step 3. Artificial satellite — includes — Space probe. A spacecraft.
4. Step 4. Space probe — uses — Multistage rocket. Launch.

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