Who is wearing a hat?
The policeman is wearing a hat.
    src        edge_attr  dst
0     1  to the right of    7
1     2  to the right of    7
2     3          wearing    6
3     3  to the right of    8
4     3   to the left of    7
5     4  to the right of    6
6     6   to the left of    7
7     6   to the left of    4
8     7          wearing    4
9     7   to the left of    2
10    7   to the left of    1
11    7  to the right of    6
12    7  to the right of    3
13    7  to the right of    8
14    8   to the left of    7
15    8  to the right of   10
16    8   to the left of    3
17   10   to the left of    8