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_4, if x_4 makes tea, then x_4 is rich. There is at least one x_4 for which x_4 will not go running or x_4 will make tea. For all x_4, x_4 will go running. For all x_4, if x_4 were a taxi driver, then x_4 is rich.
Nothing can be inferred from these premises.