public class MemberAdressableSets<T> {
    Map<T, Set<T>> data = new HashMap<>();

    public void addSet(Set<T> dataSet) {
        if (dataSet.stream().anyMatch(data::containsKey)) {
            throw Exception("Key already in member addressable data");
        }
        dataSet.forEach(d -> data.put(d, dataSet));
    }

    public void updateSet(T key, T... newData) {
        Set<T> dataSet = data.get(key);
        Arrays.stream(newData).forEach(dataSet::add);
        Arrays.stream(newData).forEach(d -> data.put(d, dataSet));
    }

    public Set<T> get(T key) {
        return data.get(key);
    }
}