Consider the following premises. For all x_19, x_19 will write a letter if and only if x_19 will read a book. For all x_19, x_19 is a nurse and x_19 is fast. There is at least one x_19 for which if x_19 writes a letter, then x_19 is not a nurse. For all x_19, if x_19 takes a plane, then x_19 is reading a book. Can we infer the following from them? There is at least one x_19 for which x_19 will not take a plane.
 From the fact that for all x_19, x_19 is a nurse and x_19 is fast we can infer that for all x_19, x_19 is a nurse. From the fact that there is at least one x_19 for which if x_19 writes a letter, then x_19 is not a nurse, and that for all x_19, x_19 is a nurse we can infer that there is at least one x_19 for which x_19 will not write a letter. From the fact that for all x_19, x_19 will write a letter if and only if x_19 will read a book, and that there is at least one x_19 for which x_19 will not write a letter we can infer that there is at least one x_19 for which x_19 will not read a book. Finally, from the fact that for all x_19, if x_19 takes a plane, then x_19 is reading a book, and that there is at least one x_19 for which x_19 will not read a book we can infer that there is at least one x_19 for which x_19 will not take a plane. Therefore, the answer is yes.