Consider the following premises. For all x_2, x_2 is not a musician or x_2 will sleep. For all x_2, x_2 is a musician or x_2 is happy. For all x_2, x_2 is not happy or x_2 is sad. Can we infer the following from them? There is at least one x_2 for which neither x_2 will sleep nor x_2 is sad.
 From the fact that for all x_2, x_2 is a musician or x_2 is happy, and that for all x_2, x_2 is not a musician or x_2 will sleep we can infer that for all x_2, x_2 is happy or x_2 will sleep. Finally, from the fact that for all x_2, x_2 is happy or x_2 will sleep, and that for all x_2, x_2 is not happy or x_2 is sad we can infer that for all x_2, x_2 will sleep or x_2 is sad, which contradicts that There is at least one x_2 for which neither x_2 will sleep nor x_2 is sad. Therefore, the answer is no.