Sound card and steam locomotive: what they have in common

1. Step 1. Sound card — has part — Printed circuit board. On a printed circuit board.
2. Step 2. Printed circuit board — uses — Solder. Components are soldered on.
3. Step 3. Solder — is made of — Tin. Tin solder.
4. Step 4. Tin — is material for — Model railway. The first models were tinplate.
5. Step 5. Model railway — works like — Steam locomotive. A model.

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