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: ~s_4. s. s_4 or s_3.
s_3 can be inferred via the disjunctive syllogism rule. ~s_4 and s can be inferred via the conjunction rule. s and ~s_4 can be inferred via the conjunction rule.