What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is not sunny. If David works, then it is sunny. If it is cloudy, then David is working. If Karen were curious, then it is cloudy. If it is sunny, then Karen is curious.
David is not working. If David works, then Karen is curious. If it is cloudy, then it is sunny. If Karen were curious, then David is working. If it is sunny, then it is cloudy.