What makes up the sink?
The sink is made of glass.
    src        edge_attr  dst
0     1  to the right of    7
1     1  to the right of    6
2     2   to the left of    8
3     2   to the left of    7
4     3   to the left of   10
5     5  to the right of    7
6     5  to the right of    6
7     6  to the right of    7
8     6   to the left of    5
9     6   to the left of    1
10    6  to the right of    8
11    7  to the right of    8
12    7   to the left of    6
13    7   to the left of    1
14    7   to the left of    5
15    7  to the right of    2
16    8   to the left of    6
17    8  to the right of    2
18    8   to the left of    7
19   10  to the right of    3