Jet bridge and smartphone: what they have in common

1. Step 1. Jet bridge — is part of — Airport. Jet bridges.
2. Step 2. Airport — uses — Radar. Radars.
3. Step 3. Radar — includes — Doppler radar. A radar.
4. Step 4. Doppler radar — has part — Digital signal processor. It picks out the Doppler shift.
5. Step 5. Digital signal processor — is part of — Smartphone. Processing sound and images.

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