Spring balance and typewriter: what they have in common

1. Step 1. Spring balance — has part — Spring. A spring.
2. Step 2. Spring — is part of — Vending machine. A spring holds the dispenser.
3. Step 3. Vending machine — includes — ATM. A dispensing machine.
4. Step 4. ATM — has part — Keyboard. A PIN pad.
5. Step 5. Keyboard — is part of — Typewriter. The keys drive levers with type.

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