Is there any sandwich to the right of the lettuce?
Yes, there is a sandwich to the right of the lettuce.
    src        edge_attr  dst
0     0               on   10
1     0  to the right of    6
2     0  to the right of   10
3     0  to the right of    8
4     1  to the right of    2
5     2   to the left of    1
6     3  to the right of    8
7     3  to the right of   10
8     3               on    5
9     3  to the right of    4
10    3  to the right of    6
11    4   to the left of    3
12    6   to the left of    0
13    6   to the left of    3
14    6               on   10
15    8   to the left of    3
16    8   to the left of    0
17    9               on   10
18   10             with    9
19   10             with    0
20   10   to the left of    3
21   10   to the left of    0