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_8 <-> r_3. p_12 <-> r_3. ~p_12.
p_8 -> r_3 can be inferred via the biconditional elimination rule. p_12 -> r_3 can be inferred via the biconditional elimination rule. r_3 -> p_8 can be inferred via the biconditional elimination rule. r_3 -> p_12 can be inferred via the biconditional elimination rule. ~r_3 can be inferred via the biconditional elimination rule.