Consider the following premises. For all x_9, x_9 is poor if and only if x_9 will play squash. There is at least one x_9 for which x_9 is poor if and only if x_9 will go running. For all x_9, x_9 will go running or x_9 will play squash. Can we infer the following from them? For all x_9, x_9 is not poor.
 From the fact that for all x_9, x_9 is poor if and only if x_9 will play squash we can infer that for all x_9, if x_9 plays squash, then x_9 is poor. From the fact that there is at least one x_9 for which x_9 is poor if and only if x_9 will go running we can infer that there is at least one x_9 for which if x_9 goes running, then x_9 is poor. Finally, from the fact that there is at least one x_9 for which if x_9 goes running, then x_9 is poor, that for all x_9, if x_9 plays squash, then x_9 is poor, and that for all x_9, x_9 will go running or x_9 will play squash we can infer that there is at least one x_9 for which x_9 is poor, which contradicts that For all x_9, x_9 is not poor. Therefore, the answer is no.