Nuclear submarine and headphones: what they have in common

1. Step 1. Nuclear submarine — has part — Nuclear reactor. A reactor.
2. Step 2. Nuclear reactor — is part of — Nuclear power plant. The reactor heats the coolant.
3. Step 3. Nuclear power plant — has part — Transformer. Transformers step up the voltage so the plant's power can travel far.
4. Step 4. Transformer — has part — Copper wire. Windings.
5. Step 5. Copper wire — is part of — Headphones. A cable.

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