Are there books to the right of the mat?
Yes, there is a book to the right of the mat.
     src        edge_attr  dst
0      0   to the left of   14
1      0   to the left of   28
2      0   to the left of   21
3      0   to the left of   16
4      0   to the left of   11
..   ...              ...  ...
129   28  to the right of    0
130   28  to the right of   13
131   28  to the right of   14
132   28  to the right of   25
133   28  to the right of   21

[134 rows x 3 columns]