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_12 or q_3. t -> ~q_3. r_3 <-> q_12. ~r_3.
r_3 -> q_12 can be inferred via the biconditional elimination rule. q_12 -> r_3 can be inferred via the biconditional elimination rule. ~q_12 can be inferred via the biconditional elimination rule.