What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Richard were a writer, then Jennifer is writing a letter. Richard is a writer if and only if it is raining. If Michael works, then it is raining. If Jennifer writes a letter, then Michael is working.
If Richard were a writer, then Michael is working. If Jennifer writes a letter, then it is raining. If Richard were a writer, then it is raining. If it rains, then Richard is a writer.