Which color does the liquid have?
The liquid has green color.
    src        edge_attr  dst
0     0               in    5
1     1  to the right of    7
2     1  to the right of    9
3     4               in    5
4     4   to the left of   13
5     7   to the left of    1
6     8   to the left of   13
7     9   to the left of    1
8    11   to the left of   13
9    13  to the right of   11
10   13  to the right of    8
11   13  to the right of    4