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It's fine if its incomplete. The goal of this project is getting rid of the mistakes. Just leave out what you don't know; the focus is on the relationships. Inspecting data conflicts are a clue to rule out impossibilities, and that way we can winnow it down. So a decent general guide is good enough for this task particularly if that link is in the profile.
If you get stuck on a profile, leave it & move on to the next which might be easier, and getting the tree clearer will then make the harder ones easier to figure out.