String vibration and centrifugal pump: what they have in common

1. Step 1. String vibration — is used in — Harpsichord. Strings.
2. Step 2. Harpsichord — has part — Keyboard. A keyboard.
3. Step 3. Keyboard — is part of — ATM. A PIN pad.
4. Step 4. ATM — is a kind of — Vending machine. A dispensing machine.
5. Step 5. Vending machine — includes — Coffee vending machine. A vending machine.
6. Step 6. Coffee vending machine — has part — Centrifugal pump. A pump supplies the water.

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