Combined heat and power plant and oil lamp: what they have in common

1. Step 1. Combined heat and power plant — uses — Coal. It burns coal or gas.
2. Step 2. Coal — uses — Coal mine. Extraction.
3. Step 3. Coal mine — uses — Davy lamp. Protection against methane explosions.
4. Step 4. Davy lamp — has part — Wick. A wick.
5. Step 5. Wick — is part of — Oil lamp. The wick feeds oil to the flame.

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