Consider the following premises. Patricia is playing squash or Sarah is working. Sarah is a sailor. Thomas is an artist if and only if Patricia is playing squash. Thomas is not an artist. Can we infer the following from them? Sarah is not working.
 From the fact that Thomas is an artist if and only if Patricia is playing squash, and that Thomas is not an artist we can infer that Patricia is not playing squash. Finally, from the fact that Patricia is playing squash or Sarah is working, and that Patricia is not playing squash we can infer that Sarah is working, which contradicts that Sarah is not working. Therefore, the answer is no.