How large is the cage to the left of the fence?
The cage is small.
    src        edge_attr  dst
0     0  to the right of   12
1     0   to the left of    5
2     0  to the right of    6
3     2   to the left of    5
4     3   to the left of    5
5     3   to the left of    9
6     5  to the right of    0
7     5  to the right of    8
8     5  to the right of   11
9     5  to the right of   12
10    5  to the right of    6
11    5  to the right of    7
12    5  to the right of   13
13    5  to the right of    2
14    5  to the right of    3
15    6   to the left of    0
16    6   to the left of    5
17    7   to the left of    5
18    7             near    9
19    8               on   10
20    8   to the left of    5
21    8  to the right of   12
22    9  to the right of   11
23    9             near    7
24    9  to the right of    3
25   11   to the left of    9
26   11   to the left of    5
27   12   to the left of    8
28   12   to the left of    5
29   12   to the left of    0
30   13   to the left of    5