Electrical grid and smartphone: what they have in common

1. Step 1. Electrical grid — has part — Power line. Power lines.
2. Step 2. Power line — has part — Copper wire. Wires (often aluminium).
3. Step 3. Copper wire — is part of — Printed circuit board. Copper traces.
4. Step 4. Printed circuit board — is part of — Smartphone. The main board.

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