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 -> r_3. r_3 <-> p_3. ~p_3.
r_3 -> p_3 can be inferred via the biconditional elimination rule. p_3 -> r_3 can be inferred via the biconditional elimination rule. ~r_3 can be inferred via the biconditional elimination rule.