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: William is taking a plane or Mary is cooking. William is not taking a plane. It is late.
Mary is cooking can be inferred via the disjunctive syllogism rule. William is not taking a plane and it is late can be inferred via the conjunction rule. It is late and William is not taking a plane can be inferred via the conjunction rule.