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SUMA Y RESTA Y
HASTA
30
3 6 9
121518
21 24 27
333639
0
+ 3
10
40
1 4 7
131619
22 25 28
313437
- 3
20
40
4 8
1216
24 28
3236
0
+ 4
20
40
4 8
1216
24 28
3236
0
- 4
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