Scalpel and oil well: what they have in common

1. Step 1. Scalpel — has part — Handle. A blade holder.
2. Step 2. Handle — is part of — Toothbrush. A plastic handle.
3. Step 3. Toothbrush — is made of — Nylon. Nylon bristles (1938).
4. Step 4. Nylon — is made of — Crude oil. The raw material is petrochemical.
5. Step 5. Crude oil — uses — Oil well. Oil is extracted from wells.

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