What is the toilet brush made of?
The toilet brush is made of metal.
    src        edge_attr  dst
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1     0  to the right of    3
2     0   to the left of    6
3     1   to the left of    7
4     1   to the left of    5
5     1   to the left of   10
6     2  to the right of   11
7     2  to the right of    7
8     2  to the right of   12
9     3   to the left of   11
10    3   to the left of    7
11    3   to the left of    5
12    3   to the left of    4
13    3   to the left of    0
14    3   to the left of   10
15    3   to the left of    6
16    3   to the left of   12
17    4  to the right of    3
18    5   to the left of   11
19    5   to the left of    7
20    5   to the left of   12
21    5  to the right of    3
22    5  to the right of    1
23    6  to the right of    0
24    6  to the right of    3
25    6   to the left of   13
26    7   to the left of    2
27    7  to the right of    3
28    7  to the right of    1
29    7  to the right of    5
30    7   to the left of   15
31   10  to the right of    3
32   10  to the right of    1
33   11   to the left of    2
34   11  to the right of    3
35   11  to the right of    5
36   12  to the right of    3
37   12  to the right of    0
38   12   to the left of   13
39   12   to the left of   15
40   12   to the left of    2
41   12  to the right of    5
42   13  to the right of    6
43   13  to the right of   12
44   15  to the right of   12
45   15  to the right of    7