Manual gearbox and router: what they have in common

1. Step 1. Manual gearbox — has part — Gear. Gears.
2. Step 2. Gear — is part of — Cipher machine. Wheels set the cipher.
3. Step 3. Cipher machine — is used in — Military radio. Encryption.
4. Step 4. Military radio — has part — Antenna. It needs an antenna.
5. Step 5. Antenna — is part of — Router. Antennas.

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