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 -> w. q <-> p_1. ~p_1. ~w.
~t can be inferred via the modus tollens rule. ~p_1 and ~w can be inferred via the conjunction rule. ~w and ~p_1 can be inferred via the conjunction rule. q -> p_1 can be inferred via the biconditional elimination rule. p_1 -> q can be inferred via the biconditional elimination rule. ~q can be inferred via the biconditional elimination rule.