What does the gray animal watch?
The cat watches the rain.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    6
2     2  to the right of    6
3     2  to the right of    0
4     3   to the left of    4
5     3   to the left of    6
6     4  to the right of    5
7     4  to the right of    7
8     4  to the right of    3
9     5   to the left of    8
10    5   to the left of    4
11    5   to the left of    6
12    5         watching    4
13    6  to the right of    0
14    6  to the right of    7
15    6   to the left of    2
16    6  to the right of    5
17    6  to the right of    3
18    7   to the left of    4
19    7   to the left of    6
20    8  to the right of    5