Search engine and truck: what they have in common

1. Step 1. Search engine — uses — Data centre. It runs in data centres.
2. Step 2. Data centre — has part — Air conditioner. Cooling.
3. Step 3. Air conditioner — has part — Compressor. A compressor.
4. Step 4. Compressor — is part of — Air brake. A compressor pumps the air.
5. Step 5. Air brake — is part of — Truck. Air brakes, as on trains.

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