Consider the following premises. Robert is writing a letter. If Robert writes a letter, then it is windy. Karen is not a lawyer. If it is sunny, then Karen is a lawyer. It is snowing if and only if it is sunny. Can we infer the following from them? It is snowing.
 From the fact that if it is sunny, then Karen is a lawyer, and that Karen is not a lawyer we can infer that it is not sunny. From the fact that if Robert writes a letter, then it is windy, and that Robert is writing a letter we can infer that it is windy. Finally, from the fact that it is snowing if and only if it is sunny, and that it is not sunny we can infer that it is not snowing, which contradicts that It is snowing. Therefore, the answer is no.