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

// Induced graph on cells.
#0:.
#1:->#0.
#2:->#0.
#3:->#1,#2.

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

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

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

// cell #3:
0[9]: {1,2,3}