Consider the following premises. For all x_12, if x_12 were curious, then x_12 is sleeping. For all x_12, x_12 will sleep if and only if x_12 is a sailor. For all x_12, x_12 is curious if and only if x_12 is rich. For all x_12, if x_12 were happy, then x_12 is rich. For all x_12, x_12 is not a sailor. Can we infer the following from them? For all x_12, x_12 is not happy.
 From the fact that for all x_12, x_12 will sleep if and only if x_12 is a sailor, and that for all x_12, x_12 is not a sailor we can infer that for all x_12, x_12 will not sleep. From the fact that for all x_12, if x_12 were curious, then x_12 is sleeping, and that for all x_12, x_12 will not sleep we can infer that for all x_12, x_12 is not curious. From the fact that for all x_12, x_12 is curious if and only if x_12 is rich, and that for all x_12, x_12 is not curious we can infer that for all x_12, x_12 is not rich. Finally, from the fact that for all x_12, if x_12 were happy, then x_12 is rich, and that for all x_12, x_12 is not rich we can infer that for all x_12, x_12 is not happy. Therefore, the answer is yes.