Consider the following premises. It is not overcast. William is a server if and only if it is overcast. If it is sunny, then Patricia is an artist. It is sunny. Can we infer the following from them? Patricia is an artist and William is not a server.
 From the fact that William is a server if and only if it is overcast, and that it is not overcast we can infer that William is not a server. From the fact that if it is sunny, then Patricia is an artist, and that it is sunny we can infer that Patricia is an artist. Finally, from the fact that Patricia is an artist, and that William is not a server we can infer that Patricia is an artist and William is not a server. Therefore, the answer is yes.