Are the rocks small?
Yes, the rocks are small.
    src        edge_attr  dst
0     1  to the right of   16
1     2  to the right of   10
2     2  to the right of    5
3     3   to the left of    5
4     5  to the right of    3
5     5   to the left of    2
6     5  to the right of    7
7     5   to the left of    8
8     5  to the right of   10
9     7   to the left of    5
10    8  to the right of    5
11    8  to the right of   10
12    9   to the left of   14
13   10   to the left of    8
14   10   to the left of    2
15   10   to the left of    5
16   11   to the left of   13
17   13  to the right of   11
18   14  to the right of    9
19   15               in    6
20   16   to the left of    1