Are there any aliens or policemen?
No, there are no policemen or aliens.
    src        edge_attr  dst
0     1           behind    3
1     3      in front of    4
2     3      in front of    1
3     3   to the left of   10
4     3     jumping over    0
5     3   to the left of    4
6     3  to the right of    9
7     3  to the right of    8
8     4  to the right of    3
9     4         watching    3
10    4           behind    3
11    6          wearing    7
12    6  to the right of    9
13    6  to the right of    8
14    7  to the right of    9
15    7  to the right of    8
16    8          wearing    9
17    8   to the left of    6
18    8   to the left of    3
19    8   to the left of    7
20    9   to the left of    3
21    9   to the left of    7
22    9   to the left of    6
23   10  to the right of    3