What is lying on the mud?
The stones are lying on the mud.
    src        edge_attr  dst
0     0  to the right of   14
1     0  to the right of    3
2     0  to the right of   13
3     0  to the right of    1
4     0  to the right of   15
..  ...              ...  ...
78   17   to the left of   12
79   17  to the right of   14
80   17  to the right of    1
81   18   to the left of   10
82   18  to the right of    1

[83 rows x 3 columns]