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6 - 6 =













9

- 7













17 - 2 =













12 - 3 =













9

- 9













19













-  2

19

- 6













19

-  0

18













-  1

8 - 8 =













8

- 7













14













-  0

15













-  5

18 - 9 =













11













-  6

7 - 5 =













13 - 7 =













8 - 2 =

20

- 2













4 - 2 =













12 - 5 =

15













-  1

16













-  5

17 - 6 =













17 - 4 =













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