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We made a similar set of visualizations using lines on a two dimensional projected map of the earth , and found that the lines representing the tunnels were far too dense to allow for interpretation . The control of a global fuzzy model can be decomposed into controlling a set of linear submodels . Each Link State Update packet carries a set of new link state advertisements ( LSAs ) one hop further away from their point of origination . Large cities have a unique set of characteristics and problems . Some conclusions are drawn from the computational experience with a set of test cases .