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Grid test
concentration training
First, find 1 . Then, next.
01 : 00
start
21
13
49
24
16
46
5
41
15
25
22
38
19
4
14
35
10
30
3
23
48
34
8
44
17
42
36
26
12
7
37
2
28
27
31
1
33
29
11
6
32
43
9
18
45
20
40
47
39