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    }
  }

  /**
   * Returns every possible list that can be formed by choosing one element from each of the given
   * sets in order; the "n-ary <a href="http://en.wikipedia.org/wiki/Cartesian_product">Cartesian
   * product</a>" of the sets. For example:
   *
   * <pre>{@code
   * Sets.cartesianProduct(ImmutableList.of(
   *     ImmutableSet.of(1, 2),

        return false;
      }
    }
    return !iterator2.hasNext();
  }

  /**
   * Returns a string representation of {@code iterator}, with the format {@code [e1, e2, ..., en]}.
   * The iterator will be left exhausted: its {@code hasNext()} method will return {@code false}.
   */
  public static String toString(Iterator<?> iterator) {
    StringBuilder sb = new StringBuilder().append('[');

        return false;
      }
    }
    return !iterator2.hasNext();
  }

  /**
   * Returns a string representation of {@code iterator}, with the format {@code [e1, e2, ..., en]}.
   * The iterator will be left exhausted: its {@code hasNext()} method will return {@code false}.
   */
  public static String toString(Iterator<?> iterator) {
    StringBuilder sb = new StringBuilder().append('[');