Mammograph and typewriter: what they have in common

1. Step 1. Mammograph — has part — Image sensor. A flat-panel detector.
2. Step 2. Image sensor — is part of — Webcam. A sensor.
3. Step 3. Webcam — is part of — Laptop. Above the screen is a small webcam for video calls.
4. Step 4. Laptop — has part — Keyboard. The keyboard is built into the laptop's case.
5. Step 5. Keyboard — is part of — Typewriter. The keys drive levers with type.

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