Polymer and diesel engine: what they have in common

1. Step 1. Polymer — includes — Nylon. A polyamide.
2. Step 2. Nylon — is made of — Crude oil. The raw material is petrochemical.
3. Step 3. Crude oil — is used in — Tanker. It carries oil.
4. Step 4. Tanker — has part — Diesel engine. A diesel.

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