Hybrid car and oil well: what they have in common

1. Step 1. Hybrid car — has part — Internal combustion engine. A combustion engine.
2. Step 2. Internal combustion engine — uses — Petrol. The fuel of a petrol engine.
3. Step 3. Petrol — is made of — Crude oil. Petrol is made from crude oil.
4. Step 4. Crude oil — uses — Oil well. Oil is extracted from wells.

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