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

// Induced graph on cells.
#0:.
#1:.
#2:->#0,#1.

// Individual cells.
// cell #0:
0[0]: {}

// cell #1:
0[1]: {}

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