Thanks for the suggestion, we take every suggestion very seriously.
We may consider Nested Set generation however, as the ISet interface doesn't allow such changes we may have to look into other alternative ways of enabling this feature.
Adding of a null item in Set is strictly prohibited. This would mean that the existence of a [Set] within a pattern may or may not have any eventual impact on response generated. Our recommendation in such cases is to create 2 patterns one with the Set and the other without the Set.
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