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_4 or w. ~w_4. p <-> w.
w can be inferred via the disjunctive syllogism rule. p -> w can be inferred via the biconditional elimination rule. w -> p can be inferred via the biconditional elimination rule.