Subtraction 1s
  • 1. 1 - 0
  • 2. 2 - 1
  • 3. 3 - 1
  • 4. 4 - 1
  • 5. 5 - 1
  • 6. 6 - 1
  • 7. 7 - 1
  • 8. 8 - 1
  • 9. 9 - 1
  • 10. 10 - 1
  • 11. 11 - 1
  • 12. 12 - 1
  • 13. 13 - 1
  • 14. 14 - 1
  • 15. 15 - 1
  • 16. 16 - 1
  • 17. 17 - 1
  • 18. 18 - 1
  • 19. 11 - 1
  • 20. 1 - 1
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