©

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

Incidence matrix

12 |  4  4 1 |  4 12 2  4 | 4  5 4
---+---------+------------+-------
 2 | 24  * * |  2  2 1  1 | 2  2 2  ab x
 2 |  * 24 * |  0  4 0  0 | 2  2 0  ah q
 2 |  *  * 6 |  0  0 0  4 | 0  0 4  ai h
---+---------+------------+-------
 3 |  3  0 0 | 16  * *  * | 1  0 1  abc xxx = verf(tet)
 3 |  1  2 0 |  * 48 *  * | 1  1 0  abi xqq = verf(trip)
 4 |  4  0 0 |  *  * 6  * | 0  2 0  abfd xxxx = verf(oct)
 4 |  2  0 2 |  *  * * 12 | 0  0 2  abjl xh(-x)h = verf(oho)
---+---------+------------+-------
 6 |  6  6 0 |  2  6 0  0 | 8  * *  abcghi verf(firp)
 5 |  4  4 0 |  0  4 1  0 | * 12 *  abfdi verf(ope)
 6 |  6  0 3 |  2  0 0  3 | *  * 8  abcjkl verf(duhd)