// Cells and their vertices.
#0={0,1,2,3,4,5,6,7,8}
#1={9}

// Induced graph on cells.
#0:.
#1:->#0.

// Individual cells.
// cell #0:
0[0]: {1,2,3,4,5,6,7} --> 2
1[1]: {1,2,3,4,5,6,7} --> 2
2[2]: {1,2,3,4,5,6,8} --> 0,1,3
3[3]: {1,2,3,4,5,7,8} --> 2,4
4[4]: {1,2,3,4,6,7,8} --> 3,5
5[5]: {1,2,3,5,6,7,8} --> 4,6
6[6]: {1,2,4,5,6,7,8} --> 5,7
7[7]: {1,3,4,5,6,7,8} --> 6,8
8[8]: {2,3,4,5,6,7,8} --> 7

// cell #1:
0[9]: {1,2,3,4,5,6,7,8}