Twisted rope strands and headphones: what they have in common

1. Step 1. Twisted rope strands — is part of — Rope. Twisted bundles of fibre.
2. Step 2. Rope — evolved into — Wire rope. A steel counterpart of rope.
3. Step 3. Wire rope — uses — Wire drawing. The wire is drawn.
4. Step 4. Wire drawing — is used in — Copper wire. Drawing.
5. Step 5. Copper wire — is part of — Headphones. A cable.

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