Coal mine and sonar: what they have in common

1. Step 1. Coal mine — is used in — Coal. Extraction.
2. Step 2. Coal — is used in — Combined heat and power plant. It burns coal or gas.
3. Step 3. Combined heat and power plant — has part — Steam turbine. Steam turns the turbine.
4. Step 4. Steam turbine — is part of — Destroyer. Turbines.
5. Step 5. Destroyer — has part — Sonar. Underwater acoustics.

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