Example of a Spine of a Hyperbolic Manifold

Below you find a presentation by boundary curves of a certain special spine of the hyperbolic manifold obtained by Dehn filling of the figure-eight knot complement with parameters (1,-4). This spine has 11 vertices, hence 12 cells and 22 edges.

1: 1 1 2 4 -5 -3
2: -1 2 6 -7 -3
3: 2 8 14 -13 19 -20 -9 -3
4: 4 16 -17 -10 -8
5: 6 13 -15 -12 -8
6: 6 19 -21 -11 -4
7: 5 11 -12 10 -9
8: 7 19 -22 -17 -9
9: 5 16 18 -13 -7
10: 11 15 -14 10 20 -22 -16
11: 12 21 -22 18 -14
12: 20 -21 15 -18 -17