Wristwatch and plough: what they have in common

1. Step 1. Wristwatch — has part — Watch strap. A strap.
2. Step 2. Watch strap — is made of — Leather. Leather.
3. Step 3. Leather — is material for — Horse collar. The collar and traces are leather.
4. Step 4. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.

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