What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Elisabeth cooks, then Mary is an electrician. Mary is not an electrician. If it snows, then Elisabeth is cooking. If Mary were an electrician, then it is snowing.
Elisabeth is not cooking. If Elisabeth cooks, then it is snowing. If it snows, then Mary is an electrician. If Mary were an electrician, then Elisabeth is cooking.