Is the hill covered by the gravel?
Yes, the hill is covered by the gravel.
    src        edge_attr  dst
0     0   to the left of   20
1     0   to the left of    5
2     0   to the left of   13
3     0   to the left of   12
4     0   to the left of   11
..  ...              ...  ...
56   20  to the right of   11
57   20   to the left of    5
58   20  to the right of   12
59   21   to the left of   16
60   21  to the right of   14

[61 rows x 3 columns]