uva11995測資B

Input:
6
1 1
1 2
1 3
2 1
2 2
2 3
6
1 1
1 2
1 3
2 3
2 2
2 1
2
1 1
2 2
4
1 2
1 1
2 1
2 2
7
1 2
1 5
1 1
1 3
2 5
1 4
2 4
1
1 89
2
1 22
1 33
3
1 67
1 66
2 67
4
1 12
2 13
1 13
2 12
5
2 12
2 12
2 12
2 12
2 12
6
1 11
2 11
1 11
2 11
1 11
2 11
7
1 11
1 12
1 13
2 11
2 12
2 13
1 14
8
1 14
1 18
2 18
1 11
1 13
2 13
2 11
2 14
9
1 71
1 77
1 76
1 78
2 78
2 77
2 76
2 71
1 81
10
1 11
2 11
1 19
1 15
2 15
2 19
1 20
1 26
2 26
2 20
11
1 71
1 72
1 73
1 74
1 75
1 76
1 77
2 71
2 72
2 73
2 74
12
1 78
1 72
1 73
1 74
1 75
1 76
1 77
2 78
2 77
2 76
2 75
2 74
Output:
queue
not sure
impossible
stack
priority queue
not sure
not sure
not sure
impossible
impossible
not sure
queue
stack
priority queue
stack
queue
priority queue