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: Barbara is a musician or it is not raining. If Richard were bored, then William is reading a book. If William reads a book, then Barbara is a musician. Richard is bored or it is raining.
If Richard were bored, then Barbara is a musician can be inferred via the transitivity rule. If it rains, then Barbara is a musician can be inferred via the rewriting rule.