What's on the mat?
The pencil is on the mat.
    src        edge_attr  dst
0     0               on    2
1     0               on   18
2     0  to the right of   15
3     0             near   13
4     0          next to   15
..  ...              ...  ...
76   16   to the left of    9
77   16  to the right of    3
78   16   to the left of   13
79   17   to the left of   15
80   18            under   15

[81 rows x 3 columns]