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Mar 22nd, 2018
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  1. Γ,A ⊢ A, Δ
  2. ____________
  3. Γ,A,¬A ⊢ Δ (¬l)
  4.  
  5. A,Γ ⊢ A, Δ
  6. _____________
  7. Γ ⊢ ¬A, A, Δ(¬r)
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