What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Patricia is sad if and only if it is windy. William is excited or it is not windy. William is not excited. If Patricia were a scientist, then Patricia is sad.
It is not windy. If it is windy, then William is excited. If Patricia were sad, then it is windy. If it is windy, then Patricia is sad.