Do you see either any balls or mailboxes?
No, there are no mailboxes or balls.
    src        edge_attr  dst
0     0  to the right of   10
1     0  to the right of    2
2     0   to the left of   11
3     2   to the left of   10
4     2  to the right of    8
5     2  to the right of    5
6     2   to the left of    0
7     3  to the right of   12
8     5   to the left of    2
9     5   to the left of   10
10    5   to the left of    8
11    7  to the right of   11
12    8   to the left of   10
13    8   to the left of    2
14    8  to the right of    5
15    9   to the left of   12
16   10   to the left of    0
17   10  to the right of    5
18   10  to the right of    2
19   10  to the right of    8
20   11  to the right of    0
21   11   to the left of    7
22   12  to the right of    9
23   12   to the left of    3