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15













-  1

11













-  6

9

- 7













9

- 9













13 - 7 =













12 - 5 =

12 - 3 =













16













-  5

7 - 5 =













20

- 2













18













-  1

17 - 6 =













8 - 2 =

19

-  0

6 - 6 =













8 - 8 =













17 - 2 =













14













-  0

18 - 9 =













15













-  5

19

- 6













17 - 4 =













4 - 2 =













8

- 7













19













-  2

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