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Or maybe "materializing specter" would be 1-10 then 11-50 because if they post over 10 posts they usually stay. If it's only 1 or 2 posts, maybe 3, then they probably won't stay. After they hit 11 posts, they most likely will stay.
However specters should be 0. They wouldn't be specters if they were anywhere from 1-50 anyway.