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_2: S_3(x_2). S_16(a_16). forall x_16: R_16(x_16) <-> S_16(x_16).
exists x: S_16(x) can be inferred via the existential generalization rule. forall x_16: R_16(x_16) -> S_16(x_16) can be inferred via the universal biconditional elimination rule. forall x_16: S_16(x_16) -> R_16(x_16) can be inferred via the universal biconditional elimination rule.