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Examples
1. One of the coolest things about my new house is the heating system.
2. There was a heating system, but it did not work.
3. Through the devices we live our cities with: cars, heating systems, outside the cities we also have industries.
4. And some of you may be switching your heating systems to electric heat pumps, which are a clever way of extracting energy from the outside environment using electricity instead of burning a fuel directly.
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