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5000 5000
1 2
2 3
3 4
4 5
5 6
5 7
6 8
7 9
9 10
8 11
11 12
12 13
12 14
14 15
15 16
16 17
16 18
18 19
18 20
20 21
20 22
22 23
23 24
23 25
23 26
26 27
27 28
28 29
27 30
30 31
29 32
32 33
33 34
32 35
35 36
36 37
35 38
36 39
38 40
38 41
41 42
42 43
43 44
42 45
44 46
45 47
47 48
48 49
48 50
49 51
51 52
52...

wrong answer Answer contains longer sequence [length = 2559], but output contains 0 elements

200000 200000
1 2
1 3
1 4
3 5
1 6
1 7
7 8
8 9
2 10
1 11
5 12
1 13
7 14
10 15
2 16
7 17
11 18
5 19
5 20
1 21
16 22
1 23
3 24
20 25
14 26
2 27
6 28
15 29
10 30
15 31
5 32
13 33
12 34
31 35
31 36
36 37
36 38
1 39
28 40
5 41
12 42
41 43
20 44
30 45
22 46
11 47
47 48
45 49
14 50
41 51
3 52
30 53
29 54
6 ...

wrong answer Answer contains longer sequence [length = 100169], but output contains 0 elements

200000 200000
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
23 24
24 25
25 26
26 27
27 28
28 29
29 30
30 31
31 32
32 33
33 34
34 35
35 36
36 37
37 38
38 39
39 40
40 41
41 42
42 43
43 44
44 45
45 46
46 47
47 48
48 49
49 50
50 51
51 ...

wrong answer Answer contains longer sequence [length = 100065], but output contains 0 elements

200000 200000
1 2
2 3
3 4
1 5
3 6
5 7
5 8
7 9
2 10
7 11
11 12
10 13
6 14
3 15
14 16
4 17
11 18
3 19
14 20
4 21
4 22
12 23
18 24
5 25
5 26
14 27
13 28
24 29
11 30
26 31
29 32
28 33
31 34
23 35
33 36
6 37
11 38
22 39
13 40
35 41
37 42
21 43
12 44
4 45
16 46
12 47
21 48
1 49
26 50
45 51
41 52
46 53
7 5...

wrong answer Answer contains longer sequence [length = 99786], but output contains 0 elements