On which side is the napkin?
The napkin is on the right of the image.
    src        edge_attr  dst
0     3               on    8
1     3               on    4
2     3  to the right of    6
3     5   to the left of    7
4     6   to the left of    7
5     6   to the left of    8
6     6               on    7
7     6   to the left of    3
8     7  to the right of    5
9     7  to the right of    6
10    8  to the right of    6