What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is snowing if and only if it is raining. William is running. If Elisabeth makes tea, then it is snowing. If it rains, then David is a musician. If David were a musician, then William is not running.
David is not a musician. If it rains, then William is not running. If it snows, then it is raining. If it rains, then it is snowing.