Incidence matrix
9 | 2 2 4 | 1 6 6 4 | 2 2 5
--+--------+-----------+------
2 | 9 * * | 0 2 0 2 | 0 2 2 ab x
2 | * 9 * | 1 0 2 2 | 2 1 2 ad x
2 | * * 18 | 0 2 2 0 | 1 1 2 ae q
--+--------+-----------+------
3 | 0 3 0 | 3 * * * | 2 0 0 adg xxx verf(tet)
3 | 1 0 2 | * 18 * * | 0 1 1 abf xqq verf(trip)
3 | 0 1 2 | * * 18 * | 1 0 1 adg xqq verf(trip)
4 | 2 2 0 | * * * 9 | 0 1 1 abed xxxx verf(oct)
--+--------+-----------+------
6 | 0 6 6 | 2 0 6 0 | 3 * * abdegh verf(firp)
6 | 6 3 6 | 0 6 0 3 | * 3 * abcdef verf(pinnip)
5 | 2 2 4 | 0 2 2 1 | * * 9 abdei verf(ope)
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