Clearance and Creepage Analysis reduces the number of violations it reports by eliminating duplicated violations. Duplicated violations connect the same region between the same pair of surfaces. A region is a connected component of a surface bounded by one or more contours. The violations for a pair of nets after a Clearance and Creepage Analysis are said to be duplicated if they satisfy the following criteria:

The algorithm to identify distinct violations relies on some heuristic methods. Thus, it may not always recognize some paths that you consider as duplicated.