Consider the following premises. For all x_17, if x_17 were fast, then x_17 is happy. For all x_17, x_17 is not poor. For all x_17, if x_17 were happy, then x_17 is fast. There is at least one x_17 for which if x_17 were fast, then x_17 is not playing tennis. For all x_17, x_17 is poor or x_17 will play tennis. Can we infer the following from them? For all x_17, x_17 is happy.
 From the fact that for all x_17, if x_17 were happy, then x_17 is fast, and that for all x_17, if x_17 were fast, then x_17 is happy we can infer that for all x_17, x_17 is happy if and only if x_17 is fast. From the fact that for all x_17, x_17 is poor or x_17 will play tennis, and that for all x_17, x_17 is not poor we can infer that for all x_17, x_17 will play tennis. From the fact that for all x_17, x_17 is happy if and only if x_17 is fast we can infer that for all x_17, if x_17 were happy, then x_17 is fast. From the fact that there is at least one x_17 for which if x_17 were fast, then x_17 is not playing tennis, and that for all x_17, x_17 will play tennis we can infer that there is at least one x_17 for which x_17 is not fast. Finally, from the fact that for all x_17, if x_17 were happy, then x_17 is fast, and that there is at least one x_17 for which x_17 is not fast we can infer that there is at least one x_17 for which x_17 is not happy, which contradicts that For all x_17, x_17 is happy. Therefore, the answer is no.