Dam gates and air conditioner: what they have in common

1. Step 1. Dam gates — is part of — Dam. They regulate the release of water.
2. Step 2. Dam — is part of — Hydroelectric power station. The dam creates the head of water.
3. Step 3. Hydroelectric power station — is a kind of — Power station. A kind of power station.
4. Step 4. Power station — is part of — Electrical grid. Power stations feed the grid.
5. Step 5. Electrical grid — is used in — Data centre. Power.
6. Step 6. Data centre — has part — Air conditioner. Cooling.

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