The following sentence is a theorem of truth functional logic.  (P → (Q → (P ∧ Q)))  (a) Explain in a sentence how to use a natural deduction proof to show that a  sentence of TFL is a theorem (1 point).  (b) Using any of the proof rules (from Ch. 16 & 18 of the text) in the natural  deduction system, complete a proof that shows that this sentence is a theorem

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