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_16 <-> s_4. s -> s_4. ~p_16. t_1 -> s.
p_16 -> s_4 can be inferred via the biconditional elimination rule. s_4 -> p_16 can be inferred via the biconditional elimination rule. ~s_4 can be inferred via the biconditional elimination rule.