@Override
	public String toString() {
		final int n = permutationIndexes.length;
		final StringBuffer sb = new StringBuffer("[");
		for (int j = 0; j < n; j++) {
			sb.append(permutationIndexes[j]);
			if (j < n - 1)
				sb.append(",");
		}
		sb.append("]");
		return new String(sb);
	}