Consider the following premises. For all x_12, if x_12 plays tennis, then x_12 is a cashier. For all x_12, x_12 will make tea if and only if x_12 is a cashier. There is at least one x_12 for which x_12 will play tennis or x_12 will make tea. For all x_12, x_12 is a janitor. Can we infer the following from them? If we can, name the inference rule being used: For all x_12, if x_12 plays tennis, then x_12 is a cashier.
That is one of the premises. Therefore, the answer is yes.