Is the black knife on the left side?
Yes, the knife is on the left of the image.
     src        edge_attr  dst
0      0   to the left of   19
1      1  to the right of   42
2      1  to the right of   32
3      1               on   10
4      2               on    3
..   ...              ...  ...
238   42   to the left of   30
239   42   to the left of   29
240   42   to the left of   16
241   42   to the left of   10
242   42   to the left of    1

[243 rows x 3 columns]