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Jun 26th, 2019
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  1. 1 C Ʌ D Premiss
  2. 2 C ↔ E Premiss
  3. 3 D ↔ F Premiss
  4. 4 D → F 3 (↔E)
  5. 5 C → E 2 (↔E)
  6. 6 E Ʌ D 1, 5
  7. 7 E Ʌ F 3, 6
  8.  
  9. 1 C Ʌ D Premiss
  10. 2 C ↔ E Premiss
  11. 3 D ↔ F Premiss
  12. 4 D 1 (ɅE)
  13. 5 D → F 3 (↔E)
  14. 6 F 4, 5 (->E)
  15. 7 C 1 (ɅE)
  16. 8 C → E 2 (↔E)
  17. 9 E 7, 8 (->E)
  18. 10 E Ʌ F 6, 9 (ɅI)
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