Consider the following premises. There is at least one x_18 for which if x_18 were curious, then x_18 is a janitor. For all x_18, if x_18 were a janitor, then x_18 is a taxi driver. For all x_18, x_18 is not a taxi driver. For all x_18, x_18 is curious or x_18 will play squash. Can we infer the following from them? If we can, name the inference rule being used: For all x_18, x_18 is not a taxi driver.
That is one of the premises. Therefore, the answer is yes.