What is mounted on the wall?
The clock is mounted on the wall.
     src        edge_attr  dst
0      0   to the left of    1
1      0  to the right of    8
2      0   to the left of   17
3      0   to the left of   19
4      0   to the left of   16
..   ...              ...  ...
100   19   to the left of   16
101   19  to the right of    6
102   19  to the right of    0
103   19  to the right of    8
104   19   to the left of    5

[105 rows x 3 columns]