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_11: R_11(x_11) <-> S_11(x_11). ~S_11(i_1). ~S_22(a_22). forall x_22: R_22(x_22) <-> S_22(x_22).
~S_11(i_1) and ~S_22(a_22) can be inferred via the conjunction rule. ~S_22(a_22) and ~S_11(i_1) 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_22: R_22(x_22) -> S_22(x_22) 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. forall x_22: S_22(x_22) -> R_22(x_22) can be inferred via the universal biconditional elimination rule.