Consider the following premises. For all x_8, x_8 will take a plane. For all x_8, x_8 is a carpenter if and only if x_8 will take a plane. Can we infer the following from them? For all x_8, x_8 is a carpenter or x_8 is a mechanic.
 From the fact that for all x_8, x_8 is a carpenter if and only if x_8 will take a plane we can infer that for all x_8, if x_8 takes a plane, then x_8 is a carpenter. From the fact that for all x_8, if x_8 takes a plane, then x_8 is a carpenter, and that for all x_8, x_8 will take a plane we can infer that for all x_8, x_8 is a carpenter. Finally, from the fact that for all x_8, x_8 is a carpenter we can infer that for all x_8, x_8 is a carpenter or x_8 is a mechanic. Therefore, the answer is yes.