What is the field surrounded by?
The field is surrounded by the hill.
    src        edge_attr  dst
0     0             near    1
1     0             near   11
2     0   to the left of    5
3     1             near    0
4     2   to the left of   12
5     2   to the left of    4
6     3          wearing    7
7     3   to the left of   12
8     3   to the left of    4
9     3   to the left of   13
10    3   to the left of    6
11    3       running on    9
12    4          holding   13
13    4  to the right of    7
14    4  to the right of    2
15    4  to the right of    3
16    5  to the right of    0
17    6  to the right of    7
18    6  to the right of    3
19    6  to the right of   13
20    7   to the left of    6
21    7   to the left of    4
22    7   to the left of   13
23    9    surrounded by   10
24   11             near    0
25   12  to the right of    2
26   12  to the right of    3
27   13  to the right of    7
28   13   to the left of    6
29   13  to the right of    3