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This is an implementation of BK-Tree, which has competitive characotrs: 1)It provides effective search in a given metric space. 2)The structure is very simple. 3)In pragmatic situation, tree-height is balanced. i.e. height is O(log n) where n is the number of elements in the tree. More about BK-Tree, see: http://en.wikipedia.org/wiki/BK-tree http://blog.notdot.net/2007/4/Damn-Cool-Algorithms-Part-1-BK-Trees