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We've gone through several drafts of new algorithms for search. After some student-testing and comments from reviewers, we have a new version, as shown in aima4e-algorithms.pdf and in https://github.com/aimacode/aima-python/blob/master/search4e.ipynb
This version tested better than previous ones, so this is what we're going with, it will require some changes to the 3e version, and even to some work that some of you did earlier on changes to 4e. (Sorry to give you extra work.)