Do you see either any boxes or printers there?
No, there are no printers or boxes.
     src        edge_attr  dst
0      1   to the left of   33
1      1   to the left of    5
2      1   to the left of    2
3      1   to the left of   16
4      1  to the right of   13
..   ...              ...  ...
137   38  to the right of   13
138   38   to the left of    5
139   38  to the right of   18
140   38   to the left of   16
141   40  to the right of   31

[142 rows x 3 columns]