How tall is the fence?
The fence is short.
    src        edge_attr  dst
0     0             near    6
1     0               by    6
2     0  to the right of   12
3     0  to the right of    2
4     0  to the right of   15
5     1  to the right of   13
6     1  to the right of   10
7     1  to the right of    2
8     2   to the left of    1
9     2   to the left of    0
10    2          next to    7
11    2      in front of    7
12    2   to the left of    3
13    3  to the right of   15
14    3  to the right of   16
15    3  to the right of   13
16    3  to the right of    5
17    3  to the right of    2
18    3  to the right of   12
19    4   to the left of   14
20    4               of    7
21    5  to the right of   12
22    5   to the left of    3
23    5  to the right of   15
24    6             near    0
25    6  to the right of   15
26    6             near    7
27    7           behind    2
28    7             near    6
29    7             near    2
30    8  to the right of   15
31   10   to the left of    1
32   10               of   13
33   10  to the right of   15
34   12   to the left of    3
35   12   to the left of    0
36   12        on top of    2
37   12   to the left of   13
38   12   to the left of    5
39   13   to the left of    3
40   13  to the right of   12
41   13  to the right of   15
42   13       sitting on    2
43   13   to the left of    1
44   13          wearing    5
45   13               on    2
46   14               on    7
47   14  to the right of    4
48   15   to the left of    0
49   15   to the left of    6
50   15   to the left of    8
51   15   to the left of   10
52   15   to the left of   16
53   15   to the left of    3
54   15   to the left of   13
55   15   to the left of    5
56   16   to the left of    3
57   16  to the right of   15