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100
5 8
1 2
1 3
1 4
1 5
2 1
3 1
4 1
5 1
5 10
1 3
1 4
2 3
2 5
3 1
3 4
3 5
4 2
5 1
5 3
5 10
1 4
2 3
2 5
3 1
3 5
4 2
4 3
4 5
5 1
5 2
3 6
1 2
1 3
2 1
2 3
3 1
3 2
5 10
1 2
1 5
2 3
2 4
3 1
4 3
4 5
5 2
5 3
5 4
4 10
1 2
1 3
1 4
2 1
2 3
2 4
3 1
3 4
4 2
4 3
5 10
1 2
1 3
2 1
2 4
3 1
3 5
4 2
4 5
5 3
5 4
5 10
1 ...

Case #1: IMPOSSIBLE
Case #2: 51
1 3 2 4 3 1 5 2 4 3 1 5 2 4 3 1 5 2 4 3 1 5 2 4 3 1 5 2 4 3 1 5 2 4 3 1 5 2 4 3 1 5 2 4 1 5 3 5 2 4 1 
Case #3: 51
1 3 2 4 1 3 2 4 1 5 3 2 4 1 5 3 2 4 1 5 3 2 4 1 5 3 2 4 1 5 3 2 4 1 5 3 2 4 1 5 3 4 1 5 3 2 5 2 5 4 1 
Case #4: 19
1 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 3 1 ...

wrong answer invalid move (from 3 to 2) (test case 2)

100
199 4980
1 95
1 96
1 105
1 124
1 130
1 131
1 135
1 137
1 139
1 140
1 141
1 147
1 155
1 172
1 174
1 179
1 183
1 188
1 193
1 196
1 197
2 3
2 5
2 13
2 14
2 17
2 20
2 24
2 26
2 30
2 41
2 44
2 45
2 52
2 56
2 67
2 70
2 71
2 74
2 78
2 84
2 85
2 90
2 92
2 93
2 97
2 107
2 111
2 113
2 122
2 124
2 128
2 13...

Case #1: IMPOSSIBLE
Case #2: IMPOSSIBLE
Case #3: 1000001
1 11 17 4 7 17 4 11 17 21 11 17 4 7 3 5 9 13 18 1 25 11 17 4 23 25 11 17 4 7 23 25 11 17 4 7 3 5 2 8 23 25 11 17 4 7 10 19 21 9 13 18 1 6 8 23 25 11 17 4 7 3 20 19 21 9 13 18 1 6 8 23 25 11 17 4 22 20 19 21 9 13 10 22 20 19 21 9 13 18 1 6 8 23...

wrong answer invalid move (from 1 to 11) (test case 3)