What color are the rocks?
The rocks are white.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    5
2     0   to the left of   10
3     0   to the left of    9
4     0   to the left of    2
5     0   to the left of    1
6     0   to the left of    4
7     0   to the left of    3
8     1   to the left of    5
9     1   to the left of    4
10    1   to the left of    2
11    1  to the right of    0
12    2  to the right of    1
13    2  to the right of    0
14    3               on    0
15    3  to the right of   11
16    3  to the right of    0
17    4  to the right of    1
18    4  to the right of    0
19    5  to the right of    1
20    5  to the right of    0
21    6  to the right of    0
22    6   to the left of   12
23    7   to the left of   10
24    7   to the left of    9
25    8               on    0
26    9  to the right of    0
27    9  to the right of   10
28    9  to the right of    7
29    9  to the right of   11
30   10  to the right of    7
31   10  to the right of   11
32   10  to the right of    0
33   10   to the left of    9
34   11   to the left of    9
35   11   to the left of    3
36   11   to the left of   10
37   12  to the right of    6