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| 19 - 18 = | 1 - 0 = | 0 + 16 = | 4 + 0 = |
| 3 + 13 = | 19 - 19 = | 20 - 0 = | 17 - 17 = |
| 18 - 18 = | 6 + 13 = | 17 - 0 = | 3 - 3 = |
| 18 - 4 = | 4 + 1 = | 15 + 3 = | 5 + 1 = |
| 1 + 4 = | 16 - 6 = | 2 + 2 = | 14 - 13 = |
| 6 + 1 = | 18 - 11 = | 17 - 4 = | 10 + 7 = |
| 8 + 11 = | 4 + 12 = | 12 - 12 = | 15 - 2 = |
| 19 - 5 = | 3 + 6 = | 18 - 3 = | 8 - 4 = |
| 14 - 1 = | 8 + 1 = | 13 + 5 = | 7 - 5 = |
| 11 - 1 = | 1 + 15 = | 14 - 11 = | 19 - 14 = |
| 0 + 11 = | 1 + 2 = | 2 + 5 = | 1 + 12 = |
| 10 - 0 = | 5 + 3 = | 16 + 3 = | 3 + 4 = |
| 13 + 0 = | 6 + 11 = | 18 - 15 = | 10 + 8 = |
| 17 - 14 = | 7 - 1 = | 6 - 1 = | 8 - 6 = |
| 9 - 5 = | 15 - 11 = | 16 - 3 = | 17 - 5 = |
| 11 + 4 = | 7 + 0 = | 15 - 13 = | 0 + 12 = |
| 3 + 5 = | 15 - 10 = | 4 - 4 = | 10 + 0 = |
| 0 + 17 = | 7 - 2 = | 6 - 2 = | 17 - 7 = |
| 17 - 2 = | 2 + 6 = | 5 + 13 = | 1 + 5 = |
| 0 + 20 = | 0 + 7 = | 6 - 0 = | 2 + 16 = |
| 8 + 10 = | 10 + 4 = | 13 - 12 = | 7 - 7 = |
| 2 + 12 = | 13 + 6 = | 20 - 20 = | 15 + 4 = |
| 18 - 1 = | 4 - 0 = | 16 - 16 = | 17 - 15 = |
| 7 + 1 = | 2 + 1 = | 0 + 1 = | 3 + 3 = |
| 2 + 11 = | 17 - 3 = | 0 + 18 = | 0 + 14 = |