Consider the following premises. There is at least one x_6 for which if x_6 were a police officer, then x_6 is a carpenter. For all x_6, x_6 is a police officer or x_6 is not fast. For all x_6, x_6 is fast. Can we infer the following from them? For all x_6, x_6 is not a carpenter.
 From the fact that for all x_6, x_6 is a police officer or x_6 is not fast we can infer that for all x_6, if x_6 were fast, then x_6 is a police officer. From the fact that for all x_6, if x_6 were fast, then x_6 is a police officer, and that for all x_6, x_6 is fast we can infer that for all x_6, x_6 is a police officer. Finally, from the fact that there is at least one x_6 for which if x_6 were a police officer, then x_6 is a carpenter, and that for all x_6, x_6 is a police officer we can infer that there is at least one x_6 for which x_6 is a carpenter, which contradicts that For all x_6, x_6 is not a carpenter. Therefore, the answer is no.