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I've for the last couple of weeks been using both ProM 5.2 and ProM 6.4.1 since there are some features available in ProM 5.2 which I can't find in ProM 6.4.1. Anyhow, I started to compare the results of some of the plugins available in both. When running the Heuristic Miner on the same log the resulting Heuristic Net look quite similar. However, a major difference appear when I convert the Heuristic Net to a Petri Net. The resulting Petri Net in ProM 6.4.1 is so much more complex than the resulting Petri Net in ProM 5.2. Is there a reason for this?