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 Charles were an office clerk, then it is cloudy. Charles is an office clerk. It is cold and Jessica is a writer.
It is cloudy can be inferred via the modus ponens rule. It is cold can be inferred via the simplification rule. Jessica is a writer can be inferred via the simplification rule.