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a     b                  g     h
  c                        i    
                                
d     e                  j     k
  f                        l    

Incidence matrix

12 |  2 1  2  2 | 2  3  3 2 2 | 1 3 3
---+------------+-------------+------
 2 | 12 *  *  * | 1  1  1 0 0 | 1 1 1  ab x
 2 |  * 6  *  * | 2  0  0 2 0 | 1 3 0  ag x
 2 |  * * 12  * | 0  2  0 0 1 | 1 0 2  ah q
 2 |  * *  * 12 | 0  0  2 1 1 | 0 2 2  ak h
---+------------+-------------+------
 4 |  2 2  0  0 | 6  *  * * * | 1 1 0  abgh xxxx = verf(oct)
 3 |  1 0  2  0 | * 12  * * * | 1 0 1  abi xqq = verf(trip)
 3 |  1 0  0  2 | *  * 12 * * | 0 1 1  abl xhh = verf(tut)
 4 |  0 2  0  2 | *  *  * 6 * | 0 2 0  aegk xh(-x)h = verf(oho)
 4 |  0 0  2  2 | *  *  * * 6 | 0 0 2  adhk qh(-q)h = verf(cho)
---+------------+-------------+------
 6 |  6 3  6  0 | 3  6  0 0 0 | 2 * *  abcghi verf(pinnip)
 6 |  2 3  0  4 | 1  0  2 2 0 | * 6 *  abfghl verf(rawvtip)
 6 |  2 0  4  4 | 0  2  2 0 2 | * * 6  abdeil verf(sirdop)