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. p or q_6. w -> s_4. ~p.
s_4 can be inferred via the modus ponens rule. q_6 can be inferred via the disjunctive syllogism rule. w and ~p can be inferred via the conjunction rule. ~p and w can be inferred via the conjunction rule.