Consider the following premises. If it snows, then it is cold. If it is cold, then Karen is an electrician. If Karen were an electrician, then it is late. It is not late. Can we infer the following from them? If we can, name the inference rule being used: It is snowing.
 From the fact that if it is cold, then Karen is an electrician, and that if Karen were an electrician, then it is late we can infer that if it is cold, then it is late via transitivity. From the fact that if it snows, then it is cold, and that if it is cold, then it is late we can infer that if it snows, then it is late via transitivity. Finally, from the fact that if it snows, then it is late, and that it is not late we can infer that it is not snowing via modus tollens, which contradicts that It is snowing. Therefore, the answer is no.