content: import java.util.Collection;
  
  class CustomSet<T> {
      CustomSet() {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      CustomSet(Collection<T> data) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      boolean isEmpty() {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      boolean contains(T element) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      boolean isDisjoint(CustomSet<T> other) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      boolean add(T element) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      @Override
      public boolean equals(Object obj) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      CustomSet<T> getIntersection(CustomSet<T> other) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      CustomSet<T> getUnion(CustomSet<T> other) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      CustomSet<T> getDifference(CustomSet<T> other) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  
      boolean isSubset(CustomSet<T> other) {
          throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
      }
  }
  