Consider the following premises. For all x_14, x_14 is a scientist if and only if x_14 is a soldier. For all x_14, x_14 will play squash or x_14 is sad. For all x_14, if x_14 plays squash, then x_14 is a soldier. There is at least one x_14 for which x_14 is not a scientist. Can we infer the following from them? For all x_14, x_14 is not sad.
 From the fact that for all x_14, x_14 is a scientist if and only if x_14 is a soldier, and that there is at least one x_14 for which x_14 is not a scientist we can infer that there is at least one x_14 for which x_14 is not a soldier. From the fact that for all x_14, if x_14 plays squash, then x_14 is a soldier, and that there is at least one x_14 for which x_14 is not a soldier we can infer that there is at least one x_14 for which x_14 will not play squash. Finally, from the fact that for all x_14, x_14 will play squash or x_14 is sad, and that there is at least one x_14 for which x_14 will not play squash we can infer that there is at least one x_14 for which x_14 is sad, which contradicts that For all x_14, x_14 is not sad. Therefore, the answer is no.