Consider the following premises. For all x_5, if x_5 were an electrician, then x_5 is a taxi driver. There is at least one x_5 for which x_5 is an electrician or x_5 is not a taxi driver. For all x_5, x_5 is not an electrician. Can we infer the following from them? For all x_5, x_5 is a taxi driver.
 From the fact that there is at least one x_5 for which x_5 is an electrician or x_5 is not a taxi driver we can infer that there is at least one x_5 for which if x_5 were a taxi driver, then x_5 is an electrician. From the fact that there is at least one x_5 for which if x_5 were a taxi driver, then x_5 is an electrician, and that for all x_5, if x_5 were an electrician, then x_5 is a taxi driver we can infer that there is at least one x_5 for which x_5 is a taxi driver if and only if x_5 is an electrician. Finally, from the fact that there is at least one x_5 for which x_5 is a taxi driver if and only if 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 is not a taxi driver, which contradicts that For all x_5, x_5 is a taxi driver. Therefore, the answer is no.