// Cells and their vertices.
#0={0,1,2,3,4,5,6,7,8,10,11,12,13,15,17}
#1={9,14,16,18,19,20}

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

// Individual cells.
// cell #0:
0[0]: {1,2,3,4} --> 1
1[1]: {1,2,3,5} --> 0,2,3
2[2]: {1,2,4,5} --> 1,4,5
3[3]: {1,2,3,6,7} --> 1,5
4[4]: {1,3,4,5} --> 2,6,8
5[5]: {1,2,4,6,7} --> 2,3,7,8
6[6]: {2,3,4,5} --> 4,10
7[7]: {1,2,5,6,7} --> 5,9
8[8]: {1,3,4,6,7} --> 4,5,9,10
9[10]: {1,3,5,6,7} --> 7,8,11,12
10[11]: {2,3,4,6,7} --> 6,8,12
11[12]: {1,4,5,6,7} --> 9,13
12[13]: {2,3,5,6,7} --> 9,10,13
13[15]: {2,4,5,6,7} --> 11,12,14
14[17]: {3,4,5,6,7} --> 13

// cell #1:
0[9]: {1,2,3,4,5} --> 1
1[14]: {1,2,3,4,6,7} --> 0,2
2[16]: {1,2,3,5,6,7} --> 1,3
3[18]: {1,2,4,5,6,7} --> 2,4
4[19]: {1,3,4,5,6,7} --> 3,5
5[20]: {2,3,4,5,6,7} --> 4