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_13, if x_13 were a bartender, then x_13 is making tea. For all x_13, if x_13 were a musician, then x_13 is making tea. There is at least one x_13 for which x_13 is a musician or x_13 is a bartender. For all x_13, x_13 will play tennis and x_13 is a soldier.
For all x_13, x_13 will play tennis can be inferred via the universal simplification rule. For all x_13, x_13 is a soldier can be inferred via the universal simplification rule. There is at least one x_13 for which x_13 will make tea can be inferred via the existential disjunction elimination rule.