What is common to the water and the sand?
The color, both the water and the sand are blue.
    src        edge_attr  dst
0     1   to the left of    9
1     1   to the left of    7
2     1               of    7
3     2      in front of    9
4     2           behind    5
5     2  to the right of    4
6     4   to the left of    2
7     5               on   11
8     5      floating on   10
9     5      in front of    2
10    5               in   10
11    7  to the right of    1
12    9           behind    2
13    9  to the right of    1