What's connected to the sink?
The pipe is connected to the sink.
    src        edge_attr  dst
0     0   to the left of   15
1     0   to the left of   13
2     1  to the right of    4
3     1  to the right of    7
4     1  to the right of    8
5     1  to the right of   10
6     1  to the right of   11
7     1  to the right of   14
8     1  to the right of   12
9     1  to the right of   15
10    1  to the right of    6
11    1  to the right of    5
12    1  to the right of    3
13    2     connected to   16
14    2   to the left of    3
15    2   to the left of   15
16    2   to the left of    5
17    3   to the left of   12
18    3   to the left of   14
19    3   to the left of    1
20    3  to the right of    2
21    4   to the left of    1
22    5  to the right of    2
23    5   to the left of    1
24    5   to the left of   11
25    6   to the left of    1
26    7  to the right of   11
27    7   to the left of    1
28    8  to the right of   11
29    8   to the left of    1
30   10   to the left of    1
31   11   to the left of    1
32   11   to the left of    8
33   11   to the left of    7
34   11  to the right of   13
35   11  to the right of    5
36   12               on    4
37   12  to the right of    3
38   12   to the left of    1
39   13   to the left of   15
40   13   to the left of   11
41   13  to the right of    0
42   14  to the right of    3
43   14   to the left of    1
44   15  to the right of    2
45   15  to the right of    0
46   15  to the right of   16
47   15   to the left of    1
48   15  to the right of   13
49   16               in    9
50   16   to the left of   15