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: ~t. q_1 -> p_3. p_3 -> r_2. t <-> r_2.
t -> r_2 can be inferred via the biconditional elimination rule. r_2 -> t can be inferred via the biconditional elimination rule. ~r_2 can be inferred via the biconditional elimination rule.