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There cannot possibly be a planet 9 in the Kuiper Belt. The IAU's rules are quite clear that to be a planet, it must have cleared the neighbourhood. Given the large number of planetoid sized TNOs, this clearly has not happened.
There *may* be a TNO bigger than any currently known, but it is unlikely to fit the IAU definition. Remember that if Pluto was orbiting on its own between Earth and Venus (for example), it would have fit the definition and been regarded as a planet.
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