Rapid test and plough: what they have in common

1. Step 1. Rapid test — is made of — Gold. The label is gold nanoparticles.
2. Step 2. Gold — is material for — Wristwatch. The case is gold or silver.
3. Step 3. Wristwatch — has part — Watch strap. A strap.
4. Step 4. Watch strap — is made of — Leather. Leather.
5. Step 5. Leather — is material for — Horse collar. The collar and traces are leather.
6. Step 6. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.

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