GPS (satellite navigation) and oil well: what they have in common

1. Step 1. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
2. Step 2. Reusable rocket — is made of — Kerosene. The fuel is kerosene or methane.
3. Step 3. Kerosene — is made of — Crude oil. A fraction of crude oil.
4. Step 4. Crude oil — uses — Oil well. Oil is extracted from wells.

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