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 <-> q_3. p_8 <-> q_4.
p_8 -> q_3 can be inferred via the biconditional elimination rule. p_8 -> q_4 can be inferred via the biconditional elimination rule. q_3 -> p_8 can be inferred via the biconditional elimination rule. q_4 -> p_8 can be inferred via the biconditional elimination rule.