What is the bathtub made of?
The tub is made of porcelain.
    src        edge_attr  dst
0     0               in    9
1     1               on    7
2     1   to the left of    5
3     1  to the right of    4
4     2               in    9
5     2  to the right of    3
6     3   to the left of    2
7     4   to the left of    7
8     4   to the left of    6
9     4   to the left of   10
10    4   to the left of    8
11    4   to the left of    1
12    5  to the right of    1
13    5  to the right of    7
14    6  to the right of    4
15    7  to the right of    4
16    7   to the left of    5
17    8  to the right of    4
18   10  to the right of    4