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: w_2. p_13 -> q_3. p_13 <-> w_2.
p_13 -> w_2 can be inferred via the biconditional elimination rule. w_2 -> p_13 can be inferred via the biconditional elimination rule.