What is the moss on?
The moss is on the rocks.
    src        edge_attr  dst
0     0               on    2
1     0   to the left of    5
2     0   to the left of   10
3     1   to the left of   10
4     1   to the left of    8
5     2   to the left of    5
6     3   to the left of   10
7     4   to the left of   10
8     5  to the right of    0
9     5  to the right of    2
10    6  to the right of    9
11    6   to the left of   10
12    7   to the left of   10
13    8  to the right of    1
14    8   to the left of   10
15    9   to the left of    6
16    9   to the left of   10
17   10  to the right of    6
18   10  to the right of   11
19   10  to the right of    4
20   10  to the right of    1
21   10  to the right of    9
22   10  to the right of    3
23   10  to the right of    0
24   10  to the right of    8
25   10  to the right of    7
26   11   to the left of   10