LS Algorithm - child nodes have nothing in S?

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: I've been poring over my updated code and I am convinced that it is properly working, but I am getting some very strange numbers now. After some extensive poking around, I've realized that some child nodes have empty S's. The definition of an S is all nodes it has in common with its parent. Is it possible for a child to not have anything in common with its parent and thus have an empty S? : I understand that S might be empty once evidence has been instantiated, but I'm getting empty S's even before evidence has been introduced. : -Ben Perry

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