Do you see both a plate and a knife in the scene?
Yes, there are both a knife and a plate.
    src        edge_attr  dst
0     0  to the right of    5
1     1   to the left of    6
2     2   to the left of    6
3     2  to the right of    5
4     3   to the left of    6
5     4   to the left of    6
6     5   to the left of    0
7     5           beside    3
8     5   to the left of    2
9     6  to the right of    2
10    6  to the right of    4
11    6  to the right of    3
12    6  to the right of    1