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: w -> t_2. q <-> w. ~t_2. w <-> t_2.
~w can be inferred via the modus tollens rule. q -> w can be inferred via the biconditional elimination rule. w -> t_2 can be inferred via the biconditional elimination rule. w -> q can be inferred via the biconditional elimination rule. t_2 -> w can be inferred via the biconditional elimination rule. ~w can be inferred via the biconditional elimination rule.