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Actually, I am trying to run N-1 contingency on my network, and determine maximum number of substations that will be islanded within same radial connection, for example, in case of single line tripping, 4 substations are islanded. Then another line tripping causes 5 substations (previous 4 substations + 1 additional substation) to be islanded. I want to identify the line that will cause 5 substations to be islanded. I tried to use the API: Treedat(), but I was not really capable to meet my requirement.