Consider the following premises. For all x_11, x_11 is a janitor if and only if x_11 is fast. If Karen were a scientist, then it is snowing. Linda is not fast. It is not snowing. Can we infer the following from them? Linda is a janitor.
 From the fact that if Karen were a scientist, then it is snowing, and that it is not snowing we can infer that Karen is not a scientist. From the fact that for all x_11, x_11 is a janitor if and only if x_11 is fast we can infer that Linda is a janitor if and only if Linda is fast. Finally, from the fact that Linda is a janitor if and only if Linda is fast, and that Linda is not fast we can infer that Linda is not a janitor, which contradicts that Linda is a janitor. Therefore, the answer is no.