Does the notebook look black?
Yes, the notebook is black.
    src        edge_attr  dst
0     0  to the right of    2
1     0  to the right of    3
2     1  to the right of    5
3     2               on    6
4     2   to the left of    0
5     3  to the right of    5
6     3   to the left of    0
7     4               on    6
8     5   to the left of    7
9     5   to the left of    1
10    5   to the left of    3
11    7  to the right of    5
12    7               on    6