Consider the following premises. For all x_12, if x_12 were a police officer, then x_12 is a server. For all x_12, x_12 is a carpenter or x_12 will take a plane. There is at least one x_12 for which x_12 is not a carpenter or x_12 is a police officer. For all x_12, if x_12 were sad, then x_12 is not a server. For all x_12, if x_12 takes a plane, then x_12 is a server. Can we infer the following from them? For all x_12, x_12 is sad.
 From the fact that for all x_12, x_12 is a carpenter or x_12 will take a plane, and that there is at least one x_12 for which x_12 is not a carpenter or x_12 is a police officer we can infer that there is at least one x_12 for which x_12 will take a plane or x_12 is a police officer. From the fact that for all x_12, if x_12 takes a plane, then x_12 is a server, that for all x_12, if x_12 were a police officer, then x_12 is a server, and that there is at least one x_12 for which x_12 will take a plane or x_12 is a police officer we can infer that there is at least one x_12 for which x_12 is a server. Finally, from the fact that for all x_12, if x_12 were sad, then x_12 is not a server, and that there is at least one x_12 for which x_12 is a server we can infer that there is at least one x_12 for which x_12 is not sad, which contradicts that For all x_12, x_12 is sad. Therefore, the answer is no.