What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: Elisabeth is a writer or Karen is a musician. Jessica is not a politician or Joseph is playing a game. If Elisabeth were a writer, then Jessica is a politician. Karen is a musician if and only if Jessica is a politician.
If Karen were a musician, then Jessica is a politician can be inferred via the biconditional elimination rule. If Jessica were a politician, then Karen is a musician can be inferred via the biconditional elimination rule.