Are there either any pizzas or sandwiches that are not triangular?
No, there is a pizza but it is triangular.
    src        edge_attr  dst
0     1   to the left of    9
1     1   to the left of    2
2     2  to the right of    4
3     2  to the right of    7
4     2  to the right of    5
5     2  to the right of    1
6     3   to the left of    6
7     3               on    0
8     3   to the left of    8
9     4   to the left of    2
10    4   to the left of    8
11    4   to the left of    9
12    4   to the left of   10
13    5   to the left of    2
14    6  to the right of    3
15    7               on    1
16    7   to the left of    2
17    8          holding    1
18    8          cutting    7
19    8          wearing    2
20    8          wearing    9
21    8  to the right of    3
22    8  to the right of    4
23    8          holding   10
24    8          slicing    7
25    8          wearing    6
26    9  to the right of    4
27    9  to the right of    1
28   10  to the right of    4