Is the sand brown and clean?
No, the sand is brown but dirty.
    src        edge_attr  dst
0     3               of    6
1     3  to the right of    5
2     5   to the left of    6
3     5   to the left of    3
4     5   to the left of    8
5     5               on    0
6     5   to the left of    7
7     6  to the right of    5
8     7  to the right of    5
9     8  to the right of    5
10    8               of    6