x_2 - x_0 & x_2(x_2 - x_0)& \dots & x_2^{n-1}(x_2 - x_0)\\
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Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.