On which side is the cake?
The cake is on the right of the image.
    src        edge_attr  dst
0     1               on    7
1     2  to the right of    4
2     2               on    7
3     3  to the right of    8
4     3  to the right of   11
5     4   to the left of    2
6     5               on    7
7     5   to the left of    8
8     6               on    7
9     6   to the left of    8
10    8               on    7
11    8   to the left of    3
12    8  to the right of    5
13    8   to the left of    9
14    8  to the right of    6
15    9               on    7
16    9  to the right of    8
17   10  to the right of   11
18   10               on    7
19   11               on    7
20   11   to the left of    3
21   11   to the left of   10