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: ~r_3. t_1 <-> q. w or t_1. q -> r_3.
~q can be inferred via the modus tollens rule. ~t_1 -> w can be inferred via the rewriting rule. t_1 -> q can be inferred via the biconditional elimination rule. q -> t_1 can be inferred via the biconditional elimination rule.