Are there any black clocks or cans?
Yes, there is a black can.
     src        edge_attr  dst
0      0   to the left of   26
1      0  to the right of    9
2      0  to the right of    6
3      0  to the right of   23
4      1  to the right of    2
..   ...              ...  ...
168   30   to the left of    5
169   30  to the right of   16
170   30   to the left of    7
171   30   to the left of   25
172   30   to the left of   20

[173 rows x 3 columns]