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 makes tea, then x_8 is driving a car. For all x_8, if x_8 drives a car, then x_8 is happy. For all x_8, if x_8 were happy, then x_8 is a doctor. For all x_8, if x_8 were a doctor, then x_8 is making tea.
For all x_8, if x_8 makes tea, then x_8 is happy can be inferred via the universal transitivity rule. For all x_8, if x_8 drives a car, then x_8 is a doctor can be inferred via the universal transitivity rule. For all x_8, if x_8 were happy, then x_8 is making tea can be inferred via the universal transitivity rule. For all x_8, if x_8 were a doctor, then x_8 is driving a car can be inferred via the universal transitivity rule.