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

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

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

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

// cell #2:
0[8]: {1,2,3}