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: It is cloudy or it is not snowing. If Joseph were rich, then it is snowing. If it is cloudy, then Joseph is rich.
If it is cloudy, then it is snowing can be inferred via the transitivity rule. If it snows, then it is cloudy can be inferred via the rewriting rule.