The knife is on what?
The knife is on the placemat.
    src        edge_attr  dst
0     0               on    1
1     0  to the right of    7
2     1               on    6
3     1               on    5
4     1   to the left of    9
5     1  to the right of    8
6     1  to the right of    2
7     1   to the left of   11
8     2   to the left of    1
9     2               on    5
10    3               on    1
11    4               on    1
12    5               on    6
13    7               on    6
14    7   to the left of    0
15    8   to the left of    1
16    9  to the right of    1
17    9               on    6
18   11  to the right of    1