What is the depth of the water?
The water is shallow.
    src        edge_attr  dst
0     0       walking in    3
1     1  to the right of    4
2     1           beside    3
3     1  to the right of    6
4     1  to the right of    2
5     2   to the left of    1
6     4               in    3
7     4   to the left of    1
8     4      standing in    3
9     5               in    3
10    5      swimming in    3
11    5   to the left of   10
12    6               in    3
13    6      standing in    3
14    6   to the left of    1
15    7               in    3
16    8               by    3
17   10  to the right of    5
18   10       sitting in    3
19   10               in    3