What is the happy person wearing?
The girl is wearing a hat.
   src        edge_attr  dst
0    1   to the left of    4
1    1   to the left of    2
2    2  to the right of    3
3    2  to the right of    1
4    3   to the left of    4
5    3   to the left of    2
6    3          wearing    1
7    3             with    1
8    4  to the right of    3
9    4  to the right of    1