What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_10, if x_10 were a server, then x_10 is a police officer. For all x_10, x_10 is a server or x_10 is a cashier. For all x_10, if x_10 were a police officer, then x_10 is making tea. There is at least one x_10 for which if x_10 were a cashier, then x_10 is making tea.
For all x_10, if x_10 were a server, then x_10 is making tea can be inferred via the universal transitivity rule.