Thus, a simple test that indicates fewer than three duplicate nodes with root distance 0 is sufficient for skipping Rule Note that Rule 6 must be applied in the determination of all auxiliary descriptors as well as in the final root-node determination, as for all other Sequence Rules, because it is possible for an auxiliary descriptor to result from C3 symmetry (e.g. VS300). Even if it is determined that Rule 4a -5 can be skipped due to the lack of auxiliary descriptors, Rule 6 should not be skipped without further evidence that Outcome (a) is the only possibility.