Incidence matrix
6 * | 2 1 1 | 1 2 2 1 | 1 1 2 a
* 2 | 0 3 3 | 0 3 3 3 | 1 1 3 g
----+-------+---------+------
2 0 | 6 * * | 1 1 1 0 | 1 1 1 ab x
1 1 | * 6 * | 0 2 0 1 | 1 0 2 ag q
1 1 | * * 6 | 0 0 2 1 | 0 1 2 ah h
----+-------+---------+------
3 0 | 3 0 0 | 2 * * * | 1 1 0 abc xxx = verf(tet)
2 1 | 1 2 0 | * 6 * * | 1 0 1 abg xqq = verf(trip)
2 1 | 1 0 2 | * * 6 * | 0 1 1 abh xhh = verf(tut)
2 2 | 0 2 2 | * * * 3 | 0 0 2 adgh xh(-x)h = verf(cho)
----+-------+---------+------
3 1 | 3 3 0 | 1 3 0 0 | 2 * * abcg verf(tepe)
3 1 | 3 0 3 | 1 0 3 0 | * 2 * abch verf(tip)
4 2 | 2 4 4 | 0 2 2 2 | * * 3 abedgh verf(sirdop)
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