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: P(a) <-> q. forall x_3: ~P(x_3). p -> q.
P(a) -> q can be inferred via the biconditional elimination rule. q -> P(a) can be inferred via the biconditional elimination rule.