What is the knife made of?
The knife is made of wood.
    src        edge_attr  dst
0     0   to the left of   14
1     1               in   11
2     1   to the left of    8
3     1  to the right of   15
4     1   to the left of    9
5     4               on    8
6     4               on   13
7     4   to the left of   14
8     6  to the right of   14
9     6  to the right of   13
10    6  to the right of   12
11    7   to the left of    9
12    7   to the left of    8
13    7  to the right of   15
14    8  to the right of    1
15    8  to the right of    7
16    8  to the right of   11
17    9  to the right of    1
18    9  to the right of    7
19    9  to the right of   11
20    9               in    8
21   10               on    0
22   11   to the left of    8
23   11   to the left of    9
24   12   to the left of    6
25   12   to the left of   14
26   12               in   11
27   13   to the left of    6
28   14  to the right of   12
29   14   to the left of    6
30   14  to the right of    4
31   14  to the right of    0
32   15   to the left of    7
33   15   to the left of    1