Who is watching the step?
The boy is watching the step.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of    6
2     1   to the left of    8
3     1   to the left of   10
4     1         watching    0
5     1      in front of    4
6     2  to the right of    3
7     2  to the right of    7
8     2  to the right of    6
9     3   to the left of    2
10    4           behind    1
11    6  to the right of    0
12    6   to the left of    2
13    6               on    5
14    6  to the right of    7
15    7   to the left of    6
16    7               on    5
17    7  to the right of    0
18    7   to the left of    2
19    8  to the right of    1
20   10  to the right of    1