Do you see any black zebra or cow?
No, there is a zebra but it is white.
    src        edge_attr  dst
0     2  to the right of    3
1     2  to the right of    9
2     3   to the left of    7
3     3   to the left of    6
4     3   to the left of    2
5     4   to the left of    6
6     4               on    3
7     6               in    1
8     6  to the right of    3
9     6  to the right of    4
10    6  to the right of    8
11    7  to the right of    3
12    7  to the right of    8
13    8   to the left of    7
14    8   to the left of    6
15    9   to the left of    2