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: Sarah is not an office clerk. If James were a musician, then Sarah is an office clerk. James is a musician or it is not cloudy. If it snows, then it is cloudy.
James is not a musician can be inferred via the modus tollens rule. If it is cloudy, then James is a musician can be inferred via the rewriting rule.