Is the sink different in color than the cap?
Yes, the cap is blue and the sink is white.
    src        edge_attr  dst
0     1  to the right of    6
1     2  to the right of    5
2     2  to the right of    8
3     2  to the right of    4
4     2   to the left of    7
5     4   to the left of    2
6     4   to the left of    5
7     5   to the left of    2
8     5  to the right of    4
9     5  to the right of    8
10    6   to the left of    1
11    6    drinking from    1
12    6         drinking    3
13    6           inside    9
14    7  to the right of    2
15    8   to the left of    2
16    8   to the left of    5