Portable speaker and rocket: what they have in common

1. Step 1. Portable speaker — uses — Bluetooth. Bluetooth.
2. Step 2. Bluetooth — is used in — Radio module and antenna. Bluetooth.
3. Step 3. Radio module and antenna — is part of — Space probe. Communication with Earth.
4. Step 4. Space probe — uses — Multistage rocket. Launch.
5. Step 5. Multistage rocket — is a kind of — Rocket. A multistage rocket is a rocket that drops its empty tanks on the way.

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