What's the wall around of?
The wall is around the field.
    src        edge_attr  dst
0     0   to the left of   11
1     0  to the right of    2
2     1           around    8
3     1   to the left of    5
4     1   to the left of    3
5     2   to the left of    0
6     2   to the left of   11
7     2   to the left of    3
8     2   to the left of    6
9     2   to the left of    5
10    3  to the right of    2
11    3  to the right of    1
12    4               on   12
13    4  to the right of   15
14    5          wearing    4
15    5      in front of   13
16    5  to the right of    7
17    5          holding   15
18    5      standing at   10
19    5  to the right of    1
20    5          wearing    3
21    5  to the right of   10
22    5  to the right of    2
23    6  to the right of    2
24    7   to the left of    5
25    7   to the left of   15
26    7   to the left of    9
27    9  to the right of    7
28   10   to the left of    5
29   11  to the right of    2
30   11  to the right of    0
31   12  to the right of   15
32   12               of    5
33   13           behind    5
34   15   to the left of    4
35   15  to the right of    7
36   15   to the left of   12