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: q_3. p_12 or p_3. p_3 -> t_1. p_12 <-> t_1.
p_12 -> t_1 can be inferred via the biconditional elimination rule. t_1 -> p_12 can be inferred via the biconditional elimination rule.