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