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| 16 - 5 = | 4 + 2 = | 2 + 15 = | 15 + 0 = |
| 7 + 11 = | 2 + 5 = | 14 + 3 = | 1 + 18 = |
| 14 + 1 = | 7 - 1 = | 5 - 0 = | 13 - 11 = |
| 6 + 10 = | 12 - 0 = | 6 + 12 = | 3 + 5 = |
| 18 - 4 = | 17 - 4 = | 2 - 0 = | 17 - 7 = |
| 2 + 6 = | 6 + 13 = | 17 - 0 = | 7 + 12 = |
| 3 + 1 = | 7 - 4 = | 10 + 10 = | 15 - 14 = |
| 10 + 6 = | 19 - 5 = | 18 - 8 = | 0 + 9 = |
| 16 - 11 = | 3 + 2 = | 1 + 16 = | 7 - 6 = |
| 0 + 7 = | 17 - 3 = | 13 - 13 = | 19 - 18 = |
| 3 + 0 = | 1 + 1 = | 3 - 3 = | 1 + 11 = |
| 19 - 4 = | 19 - 2 = | 14 - 2 = | 15 - 5 = |
| 9 - 1 = | 0 + 15 = |