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_16: R_16(x_16) <-> S_16(x_16). ~w. w or R_16(b_4).
R_16(b_4) can be inferred via the disjunctive syllogism rule. R_1(b_4) -> w can be inferred via the rewriting 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.