What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it snows, then it is cold. If it is cold, then it is snowing. Joseph is not cooking. It is snowing if and only if Joseph is cooking.
It is snowing if and only if it is cold. It is cold if and only if it is snowing. If it snows, then Joseph is cooking. If Joseph cooks, then it is snowing. It is not snowing.