Do we know how exactly are these certainty ratings determined? Edit: seems like it’s all arbitrary? E.g. in a PR[1] I saw random new words get added with no ex

Do we know how exactly are these certainty ratings determined? Edit: seems like it’s all arbitrary? E.g. in a PR[1] I saw random new words get added with no explanation of why a certain rating gets assigned. [1]: https://github.com/words/cuss/pull/43/files https://github.com/words/cuss/pull/43/files (nsfw too).