Do you think the clock is black?
Yes, the clock is black.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    1
2     0   to the left of    6
3     1   to the left of    2
4     1   to the left of    0
5     2  to the right of    1
6     3               on    4
7     3  to the right of    7
8     4               on    0
9     4  to the right of    7
10    4               on    2
11    4  to the right of    8
12    6  to the right of    0
13    7   to the left of    3
14    7   to the left of    4
15    7   to the left of    0
16    8   to the left of    4