Consider the following premises. For all x_11, x_11 is not a doctor. Linda is not working or Joseph is climbing a mountain. Linda is working. Can we infer the following from them? Joseph is climbing a mountain.
 From the fact that for all x_11, x_11 is not a doctor we can infer that Richard is not a doctor. From the fact that Linda is working we can infer that Linda is working or Richard is a doctor. From the fact that Linda is working or Richard is a doctor, and that Linda is not working or Joseph is climbing a mountain we can infer that Richard is a doctor or Joseph is climbing a mountain. Finally, from the fact that Richard is a doctor or Joseph is climbing a mountain, and that Richard is not a doctor we can infer that Joseph is climbing a mountain. Therefore, the answer is yes.