Are there either any canes or tennis balls in the picture?
No, there are no canes or tennis balls.
    src        edge_attr  dst
0     0  to the right of   17
1     0   to the left of    4
2     4  to the right of   10
3     4  to the right of    0
4     4  to the right of   14
5     4  to the right of   13
6     4  to the right of   17
7     8   to the left of   11
8     9  to the right of   14
9     9  to the right of   10
10   10   to the left of    9
11   10   to the left of    4
12   11  to the right of    8
13   13   to the left of    4
14   14               of    1
15   14   to the left of    4
16   14   to the left of    9
17   17   to the left of    4
18   17   to the left of    0