Harmonica and camera: what they have in common

1. Step 1. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
2. Step 2. Accordion — has part — Keyboard. A keyboard.
3. Step 3. Keyboard — is part of — Laptop. The keyboard is built into the laptop's case.
4. Step 4. Laptop — has part — Webcam. Above the screen is a small webcam for video calls.
5. Step 5. Webcam — is a kind of — Digital camera. A webcam is a small digital camera that streams video to a computer.
6. Step 6. Digital camera — evolved from — Camera. A sensor instead of film.

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