do {
          codePoints[i] = rng.nextInt(0x800);
        } while (!Character.isValidCodePoint(codePoints[i])
            || (codePoints[i] >= Character.MIN_SURROGATE
                && codePoints[i] <= Character.MAX_SURROGATE));
      }
      StringBuilder builder = new StringBuilder();
      for (int i = 0; i < codePoints.length; i++) {
        builder.appendCodePoint(codePoints[i]);
      }

        do {
          codePoints[i] = rng.nextInt(0x800);
        } while (!Character.isValidCodePoint(codePoints[i])
            || (codePoints[i] >= Character.MIN_SURROGATE
                && codePoints[i] <= Character.MAX_SURROGATE));
      }
      StringBuilder builder = new StringBuilder();
      for (int i = 0; i < codePoints.length; i++) {
        builder.appendCodePoint(codePoints[i]);
      }