Who is walking across the ground?
The people are walking across the ground.
    src        edge_attr  dst
0     1       talking to    6
1     1  to the right of    6
2     1  to the right of   12
3     2               on    8
4     2  to the right of    3
5     2  to the right of    4
6     3   to the left of    2
7     3  to the right of    4
8     4   to the left of    8
9     4   to the left of    3
10    4   to the left of    2
11    6   walking across    5
12    6   to the left of    1
13    6  to the right of   15
14    6  to the right of   12
15    6       talking to    1
16    8  to the right of   14
17    8  to the right of    4
18    8  to the right of   15
19   10  to the right of   11
20   10  to the right of   17
21   11   to the left of   17
22   11        pulled by   17
23   11   to the left of   13
24   11   to the left of   10
25   12   to the left of    6
26   12   to the left of    1
27   12   walking across    5
28   13  to the right of   16
29   13  to the right of   11
30   13  to the right of   17
31   14   to the left of    8
32   15   to the left of    6
33   15   to the left of    8
34   15       driving on    5
35   15  to the right of   18
36   16   to the left of   13
37   17  to the right of   11
38   17   to the left of   10
39   17          pulling   11
40   17   to the left of   13
41   18   to the left of   15