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Examples
1. Stratovolcanoes have plumbing systems that move magma from a chamber deep within the Earth's crust to vents at the surface.
2. But the human plumbing system doesn’t work like the one you find in an old house.
3. This commode cobra had gotten in through the plumbing system, but residents were obviously more concerned with getting it out.
4. Having a good plumbing system is good.
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