What's the hay covering?
The hay is covering the ground.
    src        edge_attr  dst
0     0   to the left of    8
1     0          full of   12
2     1   to the left of   14
3     1   to the left of   13
4     2       covered by    8
5     5   to the left of    6
6     6  to the right of    5
7     8  to the right of    0
8     8         covering    2
9    10  to the right of   12
10   10  to the right of   13
11   12   to the left of   10
12   13  to the right of    1
13   13   to the left of   10
14   14  to the right of    1