Consider the following premises. If it snows, then Karen is a lawyer. It is not snowing. If Karen were not a lawyer, then it is late. If Karen were a lawyer, then it is snowing. Can we infer the following from them? It is not late.
 From the fact that if it snows, then Karen is a lawyer, and that if Karen were a lawyer, then it is snowing we can infer that it is snowing if and only if Karen is a lawyer. From the fact that it is snowing if and only if Karen is a lawyer, and that it is not snowing we can infer that Karen is not a lawyer. Finally, from the fact that if Karen were not a lawyer, then it is late, and that Karen is not a lawyer we can infer that it is late, which contradicts that It is not late. Therefore, the answer is no.