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17 - 2 =













4 - 2 =













20

- 2













17 - 6 =













14













-  0

8 - 8 =













17 - 4 =













12 - 5 =

9

- 9













7 - 5 =













9

- 7













16













-  5

19

-  0

15













-  5

18













-  1

8 - 2 =

19













-  2

12 - 3 =













15













-  1

19

- 6













13 - 7 =













8

- 7













11













-  6

18 - 9 =













6 - 6 =













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