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First provide a summary of the paper, and then address the following criteria: Quality, clarity, originality and significance. The paper proposes an algorithm for estimating the (\delta,\rho) modes of a distribution. The algorithm approximates the distribution using a tree graphical model, constructed using samples from the original distribution, and finds the modes of the tree graphical model. An algorithm for finding the modes of a tree graphical models is proposed, based on constructing an appropriate junction tree to enforce constraints. The algorithm runs in polynomial time in most parameters but in exponential time to the degree of the tree.