Consider the following premises. For all x_9, if x_9 listens to a song, then x_9 is happy. There is at least one x_9 for which if x_9 listens to a song, then x_9 is not driving a car. For all x_9, x_9 will drive a car. For all x_9, if x_9 were happy, then x_9 is listening to a song. Can we infer the following from them? For all x_9, x_9 is happy.
 From the fact that for all x_9, if x_9 were happy, then x_9 is listening to a song, and that for all x_9, if x_9 listens to a song, then x_9 is happy we can infer that for all x_9, x_9 is happy if and only if x_9 will listen to a song. From the fact that there is at least one x_9 for which if x_9 listens to a song, then x_9 is not driving a car, and that for all x_9, x_9 will drive a car we can infer that there is at least one x_9 for which x_9 will not listen to a song. Finally, from the fact that for all x_9, x_9 is happy if and only if x_9 will listen to a song, and that there is at least one x_9 for which x_9 will not listen to a song we can infer that there is at least one x_9 for which x_9 is not happy, which contradicts that For all x_9, x_9 is happy. Therefore, the answer is no.