Oil well and vacuum pump: what they have in common

1. Step 1. Oil well — is used in — Crude oil. Oil is extracted from wells.
2. Step 2. Crude oil — is material for — Polyethylene. Made from petroleum products.
3. Step 3. Polyethylene — is material for — Cling film. Polyethylene.
4. Step 4. Cling film — is used in — Vacuum sealer. Film.
5. Step 5. Vacuum sealer — has part — Vacuum pump. A pump.

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