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    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of    9
2     0  to the right of    3
3     0   to the left of    2
4     0  to the right of    1
5     1   to the left of    0
6     1   to the left of   12
7     1  to the right of    4
8     1   to the left of    2
9     2  to the right of    3
10    2  to the right of    1
11    2  to the right of    7
12    2  to the right of    8
13    2  to the right of   12
14    2  to the right of    6
15    2  to the right of    0
16    3   to the left of    2
17    3               on    1
18    3   to the left of    0
19    3  to the right of    4
20    3   to the left of   12
21    4   to the left of    3
22    4   to the left of    1
23    4   to the left of    8
24    4   to the left of    9
25    6  to the right of   11
26    6   to the left of    2
27    6   to the left of    0
28    6               in    5
29    7   to the left of    2
30    7  to the right of   10
31    8               in    5
32    8  to the right of    9
33    8  to the right of    4
34    8   to the left of    2
35    8  to the right of   11
36    9   to the left of    8
37    9   to the left of    0
38    9               of    9
39    9  to the right of    4
40   10   to the left of    7
41   11   to the left of    8
42   11   to the left of    6
43   12  to the right of    1
44   12               on    0
45   12   to the left of    2
46   12  to the right of    3