Bowling pinsetter and monitor: what they have in common

1. Step 1. Bowling pinsetter — has part — Conveyor belt. Returning the balls.
2. Step 2. Conveyor belt — has part — Ball bearing. The rollers turn on bearings.
3. Step 3. Ball bearing — is part of — Hard disk drive. Bearings (later fluid-dynamic ones).
4. Step 4. Hard disk drive — is part of — Personal computer. A hard disk.
5. Step 5. Personal computer — has part — Monitor. A monitor.

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