How do the rocks look like, small or huge?
The rocks are small.
   src        edge_attr  dst
0    1   to the left of    3
1    3  to the right of    1
2    3  to the right of    9
3    3  to the right of    8
4    4   to the left of    6
5    5   to the left of    8
6    6  to the right of    4
7    8  to the right of    5
8    8   to the left of    3
9    9   to the left of    3