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: ~R_11(a_11). p or u_4. forall x_11: R_11(x_11) <-> S_11(x_11). ~p.
u_4 can be inferred via the disjunctive syllogism rule. ~R_11(a_11) and ~p can be inferred via the conjunction rule. ~p and ~R_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.