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4 - 2 =













19













-  2

17 - 6 =













14













-  0

15













-  5

11













-  6

9

- 7













15













-  1

9

- 9













13 - 7 =













18 - 9 =













6 - 6 =













20

- 2













17 - 2 =













16













-  5

19

-  0

8 - 2 =

7 - 5 =













12 - 5 =

17 - 4 =













12 - 3 =













8

- 7













19

- 6













18













-  1

8 - 8 =













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