Consider the following premises. For all x_19, x_19 will not write a letter. For all x_19, x_19 is a police officer or x_19 is a server. For all x_19, x_19 will take a plane. For all x_19, x_19 is not a police officer or x_19 is curious. There is at least one x_19 for which x_19 is a server if and only if x_19 will write a letter. Can we infer the following from them? There is at least one x_19 for which x_19 is curious and x_19 will take a plane.
 From the fact that for all x_19, x_19 is a police officer or x_19 is a server, and that for all x_19, x_19 is not a police officer or x_19 is curious we can infer that for all x_19, x_19 is a server or x_19 is curious. From the fact that there is at least one x_19 for which x_19 is a server if and only if x_19 will write a letter, and that for all x_19, x_19 will not write a letter we can infer that there is at least one x_19 for which x_19 is not a server. From the fact that for all x_19, x_19 is a server or x_19 is curious, and that there is at least one x_19 for which x_19 is not a server we can infer that there is at least one x_19 for which x_19 is curious. Finally, from the fact that there is at least one x_19 for which x_19 is curious, and that for all x_19, x_19 will take a plane we can infer that there is at least one x_19 for which x_19 is curious and x_19 will take a plane. Therefore, the answer is yes.