Fuel injector and headphones: what they have in common

1. Step 1. Fuel injector — is part of — Diesel engine. It injects fuel into hot compressed air.
2. Step 2. Diesel engine — is part of — Diesel locomotive. The diesel turns a generator.
3. Step 3. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.
4. Step 4. Electric generator — has part — Copper wire. Windings.
5. Step 5. Copper wire — is part of — Headphones. A cable.

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