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_17: R_17(x_17) -> S_17(x_17). S_17(a_17) -> q. R_17(a_17) <-> q.
R_17(a_17) -> q can be inferred via the biconditional elimination rule. q -> R_17(a_17) can be inferred via the biconditional elimination rule.