code: public PatternN and(Observable<? extends Object> other) {
          if (other == null) {
              throw new NullPointerException();
          }
          List<Observable<? extends Object>> list = new ArrayList<Observable<? extends Object>>();
          list.add(o1);
          list.add(o2);
          list.add(o3);
          list.add(o4);
          list.add(o5);
          list.add(o6);
          list.add(o7);
          list.add(o8);
          list.add(o9);
          list.add(other);
          return new PatternN(list);
      }
docs: Creates a pattern that matches when all nine observable sequences have an available element.
  
  @param other
  Observable sequence to match with the eight previous sequences.
  @return Pattern object that matches when all observable sequences have an available element.