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: forall x_1: W(x_1) or S_1(x_1). forall x_1: ~U_2(x_1). forall x_1: W(x_1) <-> U_2(x_1). q.
forall x_1: W(x_1) -> U_2(x_1) can be inferred via the universal biconditional elimination rule. forall x_1: U_2(x_1) -> W(x_1) can be inferred via the universal biconditional elimination rule. forall x_1: ~W(x_1) can be inferred via the universal biconditional elimination rule.