Which kind of material makes up the bat?
The bat is made of wood.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    1
2     0   to the left of   18
3     0   to the left of    3
4     0   to the left of    4
5     1  to the right of   18
6     1  to the right of    0
7     1  to the right of   14
8     1  to the right of    9
9     1  to the right of   17
10    1  to the right of    2
11    2   to the left of    3
12    2   to the left of    1
13    2   to the left of    4
14    2  to the right of    0
15    3  to the right of   14
16    3  to the right of    2
17    3  to the right of    0
18    3  to the right of   16
19    3  to the right of   17
20    3  to the right of   18
21    4  to the right of    2
22    4  to the right of    0
23    4  to the right of   18
24    6  to the right of    8
25    8   to the left of    6
26    9   to the left of    1
27    9   to the left of   18
28   11               on   12
29   11  to the right of   15
30   13  to the right of   16
31   13  to the right of   14
32   14   to the left of   13
33   14   to the left of    1
34   14   to the left of   16
35   14   to the left of    3
36   15   to the left of   11
37   16  to the right of   14
38   16   to the left of   13
39   16   to the left of    3
40   17   to the left of    3
41   17   to the left of    1
42   17   to the left of   18
43   18   to the left of    4
44   18  to the right of   17
45   18  to the right of    0
46   18  to the right of    9
47   18   to the left of    3
48   18   to the left of    1