The graph is undirected.

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0 1
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0 4
0 5
0 6
0 7
0 8
0 10
0 11
0 12
0 13
0 17
0 19
0 21
0 31
1 2
1 3
1 7
1 13
1 17
1 19
1 21
1 30
2 3
2 7
2 8
2 9
2 13
2 27
2 28
2 32
3 7
3 12
3 13
4 6
4 10
5 6
5 10
5 16
6 16
8 30
8 32
8 33
9 33
13 33
14 32
14 33
15 32
15 33
18 32
18 33
19 33
20 32
20 33
22 32
22 33
23 25
23 27
23 29
23 32
23 33
24 25
24 27
24 31
25 31
26 29
26 33
27 33
28 31
28 33
29 32
29 33
30 32
30 33
31 32
31 33
32 33

-----------------
Version 1
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