create a powerset. cannot use .collections

what additional information?

i need to create a powerset. see link. https://www.baeldung.com/java-power-set-of-a-set i need to create this except the only import i can use is arrraylist

public E pop() { if(isEmpty()) { throw new EmptySetException ("Cannot, pop. Empty"): E x = list.get(0); list.remove(0); return x; @Override public Seti> powerset() { Seti> answer = new ArrayList Set>(); return answer; @Override public SetI symmetricDifference (SetI other) ArrayList Set set2 = ArrayListSet) other.clone(); ArrayListset finallist = (ArrayListset) other.clone if I set 2.isEmpty() && this.isEmpty!)