What color are the numbers?
The numbers are red.
    src         edge_attr  dst
0     0   to the right of    5
1     0   to the right of    7
2     1   to the right of    7
3     1   to the right of    5
4     2   to the right of    7
5     3   to the right of    7
6     4    to the left of   15
7     4    to the left of   13
8     5    to the left of    1
9     5    to the left of    0
10    6   to the right of   11
11    6  on the bottom of    7
12    6    to the left of   10
13    6    to the left of   12
14    7       in front of    8
15    7    to the left of    2
16    7    to the left of    1
17    7    to the left of    0
18    7    to the left of   10
19    7    to the left of    3
20    8            behind    7
21    9         on top of    7
22    9   to the right of   14
23   10   to the right of    6
24   10   to the right of    7
25   10   to the right of   12
26   11    to the left of    6
27   11                of    7
28   12    to the left of   10
29   12   to the right of    6
30   13   to the right of    4
31   14         on top of    7
32   14    to the left of    9
33   15   to the right of    4