Question: 1. Prove that the argument is valid [(CD)C][(CD)D] 2. Prove that the following argument is valid (P(QR))(RS)(ST)(TP) 1. Prove that the argument is valid 2.

1. Prove that the argument is valid 2. Prove that the following

1. Prove that the argument is valid [(CD)C][(CD)D] 2. Prove that the following argument is valid (P(QR))(RS)(ST)(TP)

1. Prove that the argument is valid 2. Prove that the following argument is valid

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