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 late. Patricia is a sailor or it is not late. It is not snowing. If Patricia were a sailor, then it is late.
If it is late, then Patricia is a sailor. If it snows, then it is late. If it is late, then it is snowing. It is not late.