What is the muddy ground covered with?
The ground is covered with mud.
     src        edge_attr  dst
0      0  to the right of   10
1      0   to the left of    8
2      0  to the right of   17
3      0  to the right of   11
4      0  to the right of    1
..   ...              ...  ...
124   28   to the left of   26
125   28   to the left of   22
126   28   to the left of   15
127   28   to the left of   12
128   28   to the left of    4

[129 rows x 3 columns]