What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Elisabeth were a doctor, then David is curious. If it snows, then Elisabeth is a doctor. It is cold or it is snowing. It is cold if and only if David is curious.
If it snows, then David is curious. If it is cold, then David is curious. If David were curious, then it is cold.