Learning to addition for basic school
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2 +0 +6 | 1 +9 +7 | 5 +3 +8 | 6 +5 +1 | 3 +4 +4 |
0 +3 +7 | 9 +4 +4 | 3 +2 +9 | 2 +5 +5 | 5 +3 +0 |
6 +9 +7 | 5 +9 +0 | 4 +4 +9 | 7 +6 +4 | 1 +9 +8 |
1 +7 +0 | 3 +5 +8 | 9 +9 +1 | 8 +8 +8 | 8 +8 +2 |
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