What is in front of the mountains?
The houses are in front of the mountains.
    src        edge_attr  dst
0     0   to the left of   16
1     0   to the left of   15
2     1   to the left of    6
3     1   to the left of   17
4     3   to the left of   14
..  ...              ...  ...
71   22  to the right of   21
72   23   to the left of   19
73   23  to the right of   16
74   23      in front of    8
75   23  to the right of    9

[76 rows x 3 columns]