// Cells and their vertices.
#0={0}
#1={1,3,6,14}
#2={2,5,9,12}
#3={4,7,8,10,11,13}

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

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

// cell #1:
0[1]: {4} --> 1
1[3]: {3} --> 0,2
2[6]: {2} --> 1,3
3[14]: {1} --> 2

// cell #2:
0[2]: {1} --> 1
1[5]: {2} --> 0,2
2[9]: {3} --> 1,3
3[12]: {4} --> 2

// cell #3:
0[4]: {1,4} --> 1,2
1[7]: {1,3} --> 0,4,5
2[8]: {2,4} --> 0,3,4
3[10]: {3,4} --> 2
4[11]: {2,3} --> 1,2
5[13]: {1,2} --> 1