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: ~S_11(a_11). forall x_11: R_11(x_11) <-> S_11(x_11). s -> q_13. ~q_13.
~s can be inferred via the modus tollens rule. ~S_11(a_11) and ~q_13 can be inferred via the conjunction rule. ~q_13 and ~S_11(a_11) can be inferred via the conjunction rule. forall x_11: R_11(x_11) -> S_11(x_11) can be inferred via the universal biconditional elimination rule. forall x_11: S_11(x_11) -> R_11(x_11) can be inferred via the universal biconditional elimination rule.