Seat belt and transformer: what they have in common

1. Step 1. Seat belt — is part of — Car. Seat belts.
2. Step 2. Car — has part — Alternator. A generator.
3. Step 3. Alternator — has part — Rectifier. A diode bridge.
4. Step 4. Rectifier — is part of — Power supply. A rectifier.
5. Step 5. Power supply — has part — Transformer. A transformer.

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