      |         |                                                 |
|  p_0    |  q_01   |    0.        0         0         0         1    |
|         |         |                                                 |
|  p_1    |  q_03   |    0.        0         0         1         1    |
|         |         |                                                 |
|  p_2    |  q_05   |    0.        0         1         0         1    |
|         |         |                                                 |
|  p_3    | 