Consider the following premises. For all x_4, x_4 will take a plane. There is at least one x_4 for which x_4 will not take a plane or x_4 is a scientist. For all x_4, x_4 is not a nurse or x_4 is a taxi driver. Can we infer the following from them? For all x_4, neither x_4 is a scientist nor x_4 is a taxi driver.
That contradicts the premises. Therefore the answer is no.