Electric kettle and computer: what they have in common

1. Step 1. Electric kettle — has part — Heating element. A heating element in the base heats the water.
2. Step 2. Heating element — is part of — Soldering iron. A heater.
3. Step 3. Soldering iron — uses — Solder. Solder.
4. Step 4. Solder — is used in — Printed circuit board. Components are soldered on.
5. Step 5. Printed circuit board — is part of — Computer. The main board.

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