Skateboard and diesel engine: what they have in common

1. Step 1. Skateboard — is made of — Polyethylene. The wheels are polyurethane.
2. Step 2. Polyethylene — is made of — Crude oil. Made from petroleum products.
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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