Are there pizzas?
No, there are no pizzas.
    src        edge_attr  dst
0     0   to the left of    1
1     1   to the left of    8
2     1  to the right of    0
3     2   to the left of    7
4     3   to the left of    9
5     4   to the left of   12
6     7  to the right of    2
7     7   to the left of   12
8     8  to the right of    1
9     9  to the right of    3
10   12  to the right of    4
11   12  to the right of    7