Network card and typewriter: what they have in common

1. Step 1. Network card — has part — Printed circuit board. On a printed circuit board.
2. Step 2. Printed circuit board — is part of — Touchpad. The sensor grid is on a circuit board.
3. Step 3. Touchpad — is part of — Laptop. A touchpad.
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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