Removes the specified label from this set and all of its subsets.
Removes the specified element from this set and all of its subsets.
void remove(IElement element);
Deletes the specified label from this set and all of its subsets. Does not apply to subsets of Integers.
void remove(String label);
Deletes the specified label from this set and all of its subsets. Only applies to subsets of Integers.
void remove(int label);