internal override ParameterInteraction GetExcludedCombinations(Model model) { if (CachedInteraction == null) { ParameterInteraction firstInteraction = First.GetExcludedCombinations(model); ParameterInteraction secondInteraction = Second.GetExcludedCombinations(model); CachedInteraction = ParameterInteraction.Merge(model.Parameters, firstInteraction, secondInteraction, (state1, state2) => state1 == ValueCombinationState.Covered || state2 == ValueCombinationState.Covered ? ValueCombinationState.Covered : ValueCombinationState.Excluded); } return(new ParameterInteraction(CachedInteraction)); }