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

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

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

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

// cell #2:
0[4]: {1,2}