Incidence matrix according to Dynkin symbol

o3o3o3o *b3x3*c   (N,M,K → ∞)

. . . .    .      | NMK ♦    30 |    60 |   20   20 |  10
------------------+-----+-------+-------+-----------+----
. . . .    x      |   2 | 15NMK |     4 |    2    4 |   4
------------------+-----+-------+-------+-----------+----
. o . . *b3x    & |   3 |     3 | 20NMK |    1    2 |   3
------------------+-----+-------+-------+-----------+----
o3o . . *b3x    & ♦   4 |     6 |     4 | 5NMK    * |   2
. o3o . *b3x3*c   ♦   M |    3M |    2M |    * 20NK |   2
------------------+-----+-------+-------+-----------+----
o3o3o . *b3x3*c & ♦  MK |   6MK |   6MK |   MK   4K | 10N