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Oct 18th, 2017
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  1. |--------------|-------------|---------------|---------------|
  2. | α | β | α → β | β → α |
  3. |--------------|-------------|---------------|---------------|
  4. | (P ∨ ¬P ) | (P ∧ ¬P) | Contradictory | Tautologous |
  5. |--------------|-------------|---------------|---------------|
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