Consider the following premises. For all x_6, if x_6 were a sailor, then x_6 is drinking water. For all x_6, if x_6 makes tea, then x_6 is a cashier. There is at least one x_6 for which x_6 will not drink water. For all x_6, if x_6 were a cashier, then x_6 is a sailor. Can we infer the following from them? For all x_6, if x_6 were a cashier, then x_6 is a sailor.
That is one of the premises. Therefore, the answer is yes.