Incidence matrix according to Dynkin symbol

x3o3o4x4/3*a   (N,M → ∞)

. . . .      | 8NM |    3    3 |   3   6   3 |   1  3  3  1
-------------+-----+-----------+-------------+-------------
x . . .      |   2 | 12NM    * |   2   2   0 |   1  2  1  0
. . . x      |   2 |    * 12NM |   0   2   2 |   0  1  2  1
-------------+-----+-----------+-------------+-------------
x3o . .      |   3 |    3    0 | 8NM   *   * |   1  1  0  0
x . . x4/3*a |   8 |    4    4 |   * 6NM   * |   0  1  1  0
. . o4x      |   4 |    0    4 |   *   * 6NM |   0  0  1  1
-------------+-----+-----------+-------------+-------------
x3o3o .      ♦   4 |    6    0 |   4   0   0 | 2NM  *  *  *
x3o . x4/3*a ♦  24 |   24   12 |   8   6   0 |   * NM  *  *
x . o4x4/3*a ♦  4M |   2M   4M |   0   M   M |   *  * 6N  *
. o3o4x      ♦   8 |    0   12 |   0   0   6 |   *  *  * NM