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You could say that our system has two belts. The Mars \ Jupiter and the Kuipers a lot further out. I think it is more dependent on the creative dynamics of how the particular system was formed but until we get out there and look at other systems it would be hard to put rules on anything.
We keep being surprised by how many of our 'rules' are not complied with by other systems already. Planets and multiple suns eg.
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