Is the knife wooden and black?
No, the knife is black but metallic.
    src        edge_attr  dst
0     1               on    0
1     1  to the right of    6
2     2  to the right of    4
3     3  to the right of    4
4     4               on    5
5     4               in    5
6     4   to the left of    3
7     4   to the left of    2
8     5             with    4
9     6   to the left of    1
10    6               by    1
11    6               on    0