Drilling rig and dewar flask: what they have in common

1. Step 1. Drilling rig — is used in — Oil well. A well is drilled by a rig.
2. Step 2. Oil well — is used in — Crude oil. Oil is extracted from wells.
3. Step 3. Crude oil — is used in — Tanker. It carries oil.
4. Step 4. Tanker — includes — LNG carrier. A tanker.
5. Step 5. LNG carrier — has part — Dewar flask. Insulated tanks.

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