Who is on the mountain?
The boy is on the mountain.
    src        edge_attr  dst
0     0   to the left of    5
1     0  to the right of    1
2     0   to the left of    7
3     1   to the left of    7
4     1   to the left of    5
5     1               on    6
6     1   to the left of    0
7     5  to the right of    1
8     5  to the right of    0
9     7               on    6
10    7               on    3
11    7          wearing    9
12    7  to the right of    1
13    7  to the right of    0
14   11               on    8