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_8, if x_8 plays tennis, then x_8 is making tea. For all x_8, x_8 will sleep. There is at least one x_8 for which if x_8 were a cashier, then x_8 is making tea. For all x_8, x_8 will play tennis or x_8 is a cashier.
There is at least one x_8 for which x_8 will make tea can be inferred via the existential disjunction elimination rule.