Consider the following premises. If Jennifer reads a book, then Karen is playing tennis. For all z, if z were a mechanic, then z is reading a book. For all x_15, x_15 is a mechanic. Can we infer the following from them? Karen is not playing tennis.
 From the fact that for all x_15, x_15 is a mechanic we can infer that Jennifer is a mechanic. From the fact that for all z, if z were a mechanic, then z is reading a book we can infer that if Jennifer were a mechanic, then Jennifer is reading a book. From the fact that if Jennifer were a mechanic, then Jennifer is reading a book, and that Jennifer is a mechanic we can infer that Jennifer is reading a book. Finally, from the fact that if Jennifer reads a book, then Karen is playing tennis, and that Jennifer is reading a book we can infer that Karen is playing tennis, which contradicts that Karen is not playing tennis. Therefore, the answer is no.