Is this book green?
No, the book is white.
    src        edge_attr  dst
0     0               on    9
1     0   to the left of    9
2     3   to the left of    7
3     5   to the left of   12
4     6               on    1
5     7  to the right of    3
6     8   to the left of    9
7     8               on    7
8     9  to the right of    8
9     9  to the right of    0
10   10   to the left of   12
11   12  to the right of    5
12   12  to the right of   10