©

    a                    g 
   b    c             h    
e    d               i    j
    f                      

Incidence matrix

6 * |  4 1  2  2 0 | 2  4  4  4 1 0 | 4 2 2 0  a
* 4 |  0 0  3  3 3 | 0  3  3  3 3 3 | 3 3 1 1  g
----+--------------+----------------+--------
2 0 | 12 *  *  * * | 1  1  1  0 0 0 | 1 1 1 0  ab x
2 0 |  * 3  *  * * | 0  0  0  4 0 0 | 4 0 0 0  af q
1 1 |  * * 12  * * | 0  2  0  1 0 0 | 2 0 1 0  ag x
1 1 |  * *  * 12 * | 0  0  2  1 1 0 | 2 2 0 0  ai q
0 2 |  * *  *  * 6 | 0  0  0  0 1 2 | 0 2 0 1  gh x
----+--------------+----------------+--------
3 0 |  3 0  0  0 0 | 4  *  *  * * * | 0 1 1 0  abc xxx = verf(tet)
2 1 |  1 0  2  0 0 | * 12  *  * * * | 1 0 1 0  abg xxx = verf(tet)
2 1 |  1 0  0  2 0 | *  * 12  * * * | 1 1 0 0  abj xqq = verf(trip)
2 1 |  0 1  1  1 0 | *  *  * 12 * * | 2 0 0 0  afg xqq = verf(trip)
1 2 |  0 0  0  2 1 | *  *  *  * 6 * | 0 2 0 0  aij xqq = verf(trip)
0 3 |  0 0  0  0 3 | *  *  *  * * 4 | 0 1 0 1  ghi xxx = verf(tet)
----+--------------+----------------+--------
4 2 |  2 2  4  4 0 | 0  2  2  4 0 0 | 6 * * *  abdfgj verf(firp)
3 3 |  3 0  0  6 3 | 1  0  3  0 3 1 | * 4 * *  abchij verf(firp)
3 1 |  3 0  3  0 0 | 1  3  0  0 0 0 | * * 4 *  abcg tet = verf(pen)
0 4 |  0 0  0  0 6 | 0  0  0  0 0 4 | * * * 1  ghij tet = verf(pen)

or
10 |  6  3 |  6  9 |  6 2
---+-------+-------+-----
 2 | 30  * |  2  1 |  2 1  x
 2 |  * 15 |  0  4 |  4 0  q
---+-------+-------+-----
 3 |  3  0 | 20  * |  1 1  xxx = verf(tet)
 3 |  1  2 |  * 30 |  2 0  xqq = verf(trip)
---+-------+-------+-----
 6 |  6  6 |  2  6 | 10 *  verf(firp)
 4 |  6  0 |  4  0 |  * 5  tet = verf(pen)