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: u_1 or R_16(a_16). S_16(a_16) -> s. forall x_16: R_16(x_16) <-> S_16(x_16). u_1 -> S_16(a_16).
R_1(a_16) -> u_1 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.