Concrete pump and personal computer: what they have in common

1. Step 1. Concrete pump — uses — Concrete. It pumps concrete.
2. Step 2. Concrete — is material for — Nuclear power plant. The containment is concrete.
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 — is part of — Switched-mode power supply. A high-frequency transformer.
5. Step 5. Switched-mode power supply — is part of — Personal computer. A power supply.

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