Consider the following premises. For all x_8, x_8 is happy if and only if x_8 is fast. For all x_8, x_8 is an electrician or x_8 is fast. There is at least one x_8 for which x_8 is a taxi driver. For all x_8, if x_8 were an electrician, then x_8 is happy. Can we infer the following from them? There is at least one x_8 for which x_8 is happy and x_8 is a taxi driver.
 From the fact that for all x_8, x_8 is happy if and only if x_8 is fast we can infer that for all x_8, if x_8 were fast, then x_8 is happy. From the fact that for all x_8, if x_8 were an electrician, then x_8 is happy, that for all x_8, if x_8 were fast, then x_8 is happy, and that for all x_8, x_8 is an electrician or x_8 is fast we can infer that for all x_8, x_8 is happy. Finally, from the fact that for all x_8, x_8 is happy, and that there is at least one x_8 for which x_8 is a taxi driver we can infer that there is at least one x_8 for which x_8 is happy and x_8 is a taxi driver. Therefore, the answer is yes.