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: p_12 -> ~w_2. r or s. s_2 or w_2. s -> p_4. ~s_2. r -> p_4.
w_2 can be inferred via the disjunctive syllogism rule. p_4 can be inferred via the disjunction elimination rule.