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 late or it is not cloudy. Patricia is not writing a letter or it is cloudy. It is late if and only if Linda is rich. Patricia is writing a letter or Linda is rich.
Linda is rich or it is cloudy can be inferred via the resolution rule. If it is cloudy, then it is late can be inferred via the rewriting rule. If it is late, then Linda is rich can be inferred via the biconditional elimination rule. If Linda were rich, then it is late can be inferred via the biconditional elimination rule.