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2. Use the natural deduction system for TFL to demonstrate the following claims of derivability. (/12) (a) AFB + A (b) B H A, C

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2. Use the natural deduction system for TFL to demonstrate the following claims of derivability. (/12) (a) AFB + A (b) B H A, C H AFC + (ANB) (c) (AA(BVC)) DED (A + B)) (d) -(A + B), -(B+C) E-D (e) A + (GVB), -(-AVB), -GE B (f) 0 F ((A + B) A) + A

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