Metal reeds and personal computer: what they have in common

1. Step 1. Metal reeds — is part of — Harmonica. Metal reeds vibrate in a flow of air.
2. Step 2. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
3. Step 3. Accordion — has part — Keyboard. A keyboard.
4. Step 4. Keyboard — is part of — Personal computer. A keyboard.

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