.inOrder();
  }

  public void testAddManyPairs() {
    for (int aLow = 0; aLow < 6; aLow++) {
      for (int aHigh = 0; aHigh < 6; aHigh++) {
        for (BoundType aLowType : BoundType.values()) {
          for (BoundType aHighType : BoundType.values()) {
            if ((aLow == aHigh && aLowType == OPEN && aHighType == OPEN) || aLow > aHigh) {
              continue;
            }