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2 - 1 = 1

5 -1 = 4

8 - 4 = 4

5 + 4 = 9

6 - 5 = 1

2 + 3 = 5

7 - 4 = 3

1 + 7 = 8

10 - 1 = 9

6 - 3 = 3

9 + 1 = 10

4 + 1 = 5

1 + 1 = 2

5 - 3 = 2

8 - 7 = 1

9 - 4 = 5

3 + 4 = 7

1 + 5 = 6

3 + 3 = 6

4 + 4 = 8