Are there black words or numbers?
No, there are numbers but they are red.
    src        edge_attr  dst
0     0  to the right of   20
1     1   to the left of   19
2     1  to the right of   18
3     1  to the right of    2
4     2   to the left of    5
5     2   to the left of    1
6     2   to the left of    6
7     3  to the right of   10
8     4  to the right of   10
9     5  to the right of    2
10    6  to the right of    2
11    6   to the left of   19
12    6  to the right of   18
13    7   to the left of   16
14    9   to the left of   15
15    9            below   14
16   10   to the left of    3
17   10   to the left of    4
18   11  to the right of   13
19   11   to the left of   21
20   11  to the right of   20
21   12  to the right of   16
22   13   to the left of   18
23   13   to the left of   11
24   15  to the right of    9
25   15               on   17
26   16  to the right of    7
27   16   to the left of   12
28   18  to the right of   13
29   18   to the left of    6
30   18   to the left of    1
31   18   to the left of   21
32   18  to the right of   20
33   18          wearing   11
34   18       working in    8
35   19  to the right of    1
36   19  to the right of    6
37   20   to the left of   18
38   20   to the left of    0
39   20   to the left of   11
40   21  to the right of   11
41   21  to the right of   18