(1) 1. B ⊃ (∼ C ⋅ ∼ D) 2. C ∨ D 3. B /∴ ∼ D ⊃ C    (3) 1. A ⋅ ∼ B 2. B ⊃ A 3. A ⊃ B /∴ B    (5) 1. A ⊃ (B ∨ C) 2. ∼ (∼ A ∨ C) 3. ∼ B /∴ C

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