Coffee vending machine and car: what they have in common

1. Step 1. Coffee vending machine — has part — Centrifugal pump. A pump supplies the water.
2. Step 2. Centrifugal pump — is part of — Washing machine. A drain pump.
3. Step 3. Washing machine — has part — Shock absorber. Shock absorbers damp the drum's shaking during the spin.
4. Step 4. Shock absorber — is part of — Car. Shock absorbers stop the body bouncing on a rough road.

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