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public class PetriNetUtils {
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HashSet<Pair<VisualConnection /* consuming arc */, VisualConnection /* producing arc */>> dualArcs = new HashSet<>();
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HashSet<VisualConnection> consumingArcs = PetriNetUtils.getVisualConsumingArcs(visualModel);
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HashSet<VisualConnection> producingArcs = PetriNetUtils.getVisualProducingArcs(visualModel);