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15 questions
What number is it?
52
42
62
What number is it?
49
69
59
What number is it?
31
41
51
What number is it?
76
86
96
What number is it?
65
75
85
What number is it?
25
28
27
What number is it?
29
30
28
What number is it?
53
43
33
What number is it?
94
64
84
What number is it?
81
91
71
What number is it?
48
49
47
What number is it?
44
47
45
Which numbers are missing?
23 and 63
13 and 43
2 and 32
Which numbers are missing?
36 and 66
16 and 26
56 and 76
Which numbers are missing?
38 and 88
36 and 86
31 and 81
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