What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Sarah drives a car, then Richard is an astronaut. If it is sunny, then Sarah is driving a car. If Mary were a scientist, then it is sunny. If Richard were an astronaut, then Mary is a scientist.
If Sarah drives a car, then Mary is a scientist. If it is sunny, then Richard is an astronaut. If Mary were a scientist, then Sarah is driving a car. If Richard were an astronaut, then it is sunny.