The sandwich is in front of what?
The sandwich is in front of the paper.
    src        edge_attr  dst
0     1               on    8
1     2      in front of    5
2     2             with    4
3     2             with    9
4     3               in    2
5     3               on    8
6     3             with    4
7     4               on    2
8     4               on    3
9     5           behind    2
10    6  to the right of    7
11    7  to the right of    9
12    7   to the left of    6
13    9   to the left of    7
14    9               on    2