Consider the following premises. For all x_5, x_5 is a sailor. For all x_5, x_5 will play a game. There is at least one x_5 for which x_5 is a doctor. Can we infer the following from them? Some sailors are doctors.
 From the fact that for all x_5, x_5 is a sailor, and that for all x_5, x_5 will play a game we can infer that for all x_5, x_5 is a sailor and x_5 will play a game. From the fact that for all x_5, x_5 is a sailor and x_5 will play a game we can infer that for all x_5, x_5 is a sailor. Finally, from the fact that for all x_5, x_5 is a sailor, and that there is at least one x_5 for which x_5 is a doctor we can infer that some sailors are doctors. Therefore, the answer is yes.