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