Consider the following premises. There is at least one x_5 for which if x_5 works, then x_5 is taking a plane. For all x_5, x_5 is not a writer. For all x_5, x_5 is a writer if and only if x_5 is an electrician. For all x_5, if x_5 takes a plane, then x_5 is an electrician. Can we infer the following from them? There is at least one x_5 for which x_5 will not work.
 From the fact that there is at least one x_5 for which if x_5 works, then x_5 is taking a plane, and that for all x_5, if x_5 takes a plane, then x_5 is an electrician we can infer that there is at least one x_5 for which if x_5 works, then x_5 is an electrician. From the fact that for all x_5, x_5 is a writer if and only if x_5 is an electrician, and that for all x_5, x_5 is not a writer we can infer that for all x_5, x_5 is not an electrician. Finally, from the fact that there is at least one x_5 for which if x_5 works, then x_5 is an electrician, and that for all x_5, x_5 is not an electrician we can infer that there is at least one x_5 for which x_5 will not work. Therefore, the answer is yes.