code: public <T9> Pattern9<T1, T2, T3, T4, T5, T6, T7, T8, T9> and(Observable<T9> other) {
          if (other == null) {
              throw new NullPointerException();
          }
          return new Pattern9<T1, T2, T3, T4, T5, T6, T7, T8, T9>(o1, o2, o3, o4, o5, o6, o7, o8, other);
      }
docs: Creates a pattern that matches when all eight observable sequences have an available element.
  
  @param other
  Observable sequence to match with the seven previous sequences.
  @return Pattern object that matches when all observable sequences have an available element.