Are the letters white?
No, the letters are red.
   src        edge_attr  dst
0    0  to the right of    2
1    0  to the right of    1
2    1  to the right of    2
3    1   to the left of    0
4    2   to the left of    1
5    2   to the left of    0
6    2   to the left of   13
7   13  to the right of    2