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

// Induced graph on cells.
#0:.
#1:->#0.
#2:->#0.
#3:->#0.
#4:->#0.
#5:->#1,#3.
#6:->#1,#4.
#7:->#2,#3.
#8:->#2,#4.

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

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

// cell #2:
0[2]: {2}

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

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

// cell #5:
0[5]: {1,2}

// cell #6:
0[6]: {1,2}

// cell #7:
0[7]: {1,2}

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