Re: uw sites
2s is pretty good for manual searching. There is a single non-unique relatively common 3 level site for each path, but otherwise all other 3s and all 4s are rare, unique, or both.
Ideally you'd search with 3s since then you only miss 1-2 sites per path, and those are all rare and unique. But 2s are perfectly acceptable. 1s you'd want to go over again.
That said, so long as you can stomach researching sites you've already searched, if you can get 4-5 1+s, you can get some decent gem income searching with that.
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