Generate random combinations only one number from each group of 4 letters

01 15
51 10
06 47
74 60
08 58
85 80
03 38
83 30
07 69
96 70
04 18
81 40
35 59
95 53
24 68
86 24
02 89
98 20
26 49
94 62
13 29
92 31
09 45
54 90
23 48
84 32
05 37
73 50
17 46
64 71
12 39
93 21
67 28
82 76
14 78
87 41
16 34
43 61
26 79
97 62
56 27
72 65
19 26
62 91
36 57
75 53
52 25
42 63
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Total de