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_16, x_16 is rich or x_16 will drive a car. For all x_16, if x_16 were a doctor, then x_16 is playing tennis. For all x_16, x_16 is a doctor or x_16 is a nurse. There is at least one x_16 for which if x_16 were a nurse, then x_16 is playing tennis. For all x_16, if x_16 were rich, then x_16 is not playing tennis.
There is at least one x_16 for which x_16 will play tennis can be inferred via the existential disjunction elimination rule.