Does the drawing look green?
Yes, the drawing is green.
    src        edge_attr  dst
0     0               on    6
1     0  to the right of    7
2     0  to the right of    2
3     2  to the right of    8
4     2  to the right of   10
5     2   to the left of    0
6     2  to the right of    9
7     2   to the left of    6
8     2  to the right of    3
9     3               on    4
10    3   to the left of    2
11    3               in    4
12    3  to the right of   12
13    6  to the right of    2
14    7   to the left of    0
15    8   to the left of    2
16    8               on    3
17    9   to the left of    2
18   10   to the left of    2
19   10               on    3
20   12   to the left of    3