- Q + - Q Þ Q 0 1/3 1 - 1/3 1 1/3 2 + Q - Q Þ Q 0 1/3 1 - 1/3 1 1/3 2 - Q - Q + Þ Q 0 - 1/3 1 1/3 1 - 1/3 2 - + 0 Q - Q Þ Q - 1/3 1 1/3 1 - 1/3 2