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Each Decision Tree thread keeps track of nodes that it has encountered during the run.  Since a Decision Tree's purpose is to converge on the root cause of an issue, it is never appropriate to re-visit a node.  Therefore, the Decision Tree engine tests for a loopback condition as each node is executed.  If a node is executed twice during any thread, a loopback is detected and the tree will terminate processing at that point.  The History Log in the thread will indicate that a loopback was detected.