Are there any knives on the table made of wood?
Yes, there is a knife on the table.
    src        edge_attr  dst
0     0               on    2
1     0   to the left of    7
2     0   to the left of    3
3     3   to the left of    7
4     3  to the right of    0
5     4  to the right of    5
6     4   to the left of    6
7     5               on    2
8     5   to the left of    4
9     6               on    2
10    6  to the right of    4
11    7  to the right of    0
12    7  to the right of    3