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