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 <-> s_2. forall x_11: P_11(x_11). ~s_2.
s -> s_2 can be inferred via the biconditional elimination rule. s_2 -> s can be inferred via the biconditional elimination rule. ~s can be inferred via the biconditional elimination rule.