Modem and cannon: what they have in common

1. Step 1. Modem — has part — Digital signal processor. Signal processing in high-speed modems.
2. Step 2. Digital signal processor — is part of — Doppler radar. It picks out the Doppler shift.
3. Step 3. Doppler radar — is a kind of — Radar. A radar.
4. Step 4. Radar — is used in — Anti-aircraft gun. Radar guidance.
5. Step 5. Anti-aircraft gun — is a kind of — Cannon. A gun.

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