Land vehicle and sewage treatment plant: what they have in common

1. Step 1. Land vehicle — includes — Rail vehicle. Rail transport is land transport.
2. Step 2. Rail vehicle — includes — Refrigerator car. A railway car.
3. Step 3. Refrigerator car — has part — Compressor. A refrigeration unit.
4. Step 4. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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