Biplane struts and bracing wires and transformer: what they have in common

1. Step 1. Biplane struts and bracing wires — is part of — Biplane. They tie the wings into a rigid box.
2. Step 2. Biplane — has part — Propeller. A tractor propeller.
3. Step 3. Propeller — is part of — Nuclear icebreaker. Propellers.
4. Step 4. Nuclear icebreaker — has part — Nuclear reactor. A reactor plant.
5. Step 5. Nuclear reactor — is part of — Nuclear power plant. The reactor heats the coolant.
6. Step 6. Nuclear power plant — has part — Transformer. Transformers step up the voltage so the plant's power can travel far.

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