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: Robert is a cashier or Jessica is fast. For all x_13, x_13 will make tea or x_13 is rich. For all x_13, if x_13 were rich, then x_13 is drinking water. For all x_13, if x_13 makes tea, then x_13 is drinking water. For all x_13, if x_13 were a cashier, then x_13 is not drinking water.
For all x_13, x_13 will drink water can be inferred via the universal disjunction elimination rule.