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_18, if x_18 makes tea, then x_18 is playing tennis. For all x_18, if x_18 were a politician, then x_18 is playing tennis. For all x_18, if x_18 plays tennis, then x_18 is sleeping. There is at least one x_18 for which x_18 will make tea or x_18 is a politician.
For all x_18, if x_18 makes tea, then x_18 is sleeping can be inferred via the universal transitivity rule. For all x_18, if x_18 were a politician, then x_18 is sleeping can be inferred via the universal transitivity rule. There is at least one x_18 for which x_18 will play tennis can be inferred via the existential disjunction elimination rule.