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. r_2 -> q_3. t or p. r_2.
q_3 can be inferred via the modus ponens rule. p can be inferred via the disjunctive syllogism rule. ~t and r_2 can be inferred via the conjunction rule. r_2 and ~t can be inferred via the conjunction rule.