Given the premises a b, d, d b and a, consider the following proof of b 1) 1. d Premise 2. dVa Generalization, 1 3. d b Premise 4. a b Premise 5. b Division into cases, 2, 3, 4 Step 2 is not valid O Step 4 is not valid Step 5 is not valid The premises are inconsistent Step 1 is not valid The argument is valid Step 3 is not valid

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