-
1
-
3
-
5
-
7
-
9
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11
-
13
-
15
-
17
-
19
-
11
-
14
-
17
-
20
-
23
-
26
-
29
-
32
-
35
-
38
-
31
-
35
-
39
-
43
-
47
-
51
-
55
-
59
-
63
-
67
-
51
-
56
-
61
-
66
-
71
-
76
-
81
-
86
-
91
-
96
The activity is based on 4 sets of numbers appearing slowly.
The challenge is to work out the connection between them before all are shown.