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_3 <-> s. q_1 -> s. ~p_3.
p_3 -> s can be inferred via the biconditional elimination rule. s -> p_3 can be inferred via the biconditional elimination rule. ~s can be inferred via the biconditional elimination rule.