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: If it is cloudy, then Linda is a writer. John is playing squash. It is cloudy. If Jennifer were a janitor, then Linda is not a writer.
Linda is a writer can be inferred via the modus ponens rule. John is playing squash and it is cloudy can be inferred via the conjunction rule. It is cloudy and John is playing squash can be inferred via the conjunction rule.