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: p_5 and r. ~q_22. s <-> q_22. s <-> t.
p_5 can be inferred via the simplification rule. r can be inferred via the simplification rule. s -> q_22 can be inferred via the biconditional elimination rule. s -> t can be inferred via the biconditional elimination rule. q_22 -> s can be inferred via the biconditional elimination rule. t -> s can be inferred via the biconditional elimination rule. ~s can be inferred via the biconditional elimination rule.