Wire barbs and headphones: what they have in common

1. Step 1. Wire barbs — is part of — Barbed wire. Short lengths strung on a thread.
2. Step 2. Barbed wire — uses — Wire drawing. Wire is made by drawing.
3. Step 3. Wire drawing — is used in — Copper wire. Drawing.
4. Step 4. Copper wire — is part of — Headphones. A cable.

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