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sub. doubles
Contributed by: Burke
  • 1. 18 - 9 =
  • 2. 16 - 8 =
  • 3. 14 - 7 =
  • 4. 12 - 6 =
  • 5. 10 - 5 =
  • 6. 8 - 4 =
  • 7. 6 - 3 =
  • 8. 4 - 2 =
  • 9. 2 - 1 =
  • 10. 18 - 9 =
  • 11. 16 - 8 =
  • 12. 14 - 7 =
  • 13. 12 - 6 =
  • 14. 10 - 5 =
  • 15. 8 - 4 =
  • 16. 6 - 3 =
  • 17. 4 - 2 =
  • 18. 2 - 1 =
  • 19. 18 - 9 =
  • 20. 16 - 8=
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