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_1, x_1 will make tea or x_1 will drink water. For all x_1, if x_1 makes tea, then x_1 is a politician. For all x_1, if x_1 were a politician, then x_1 is a lawyer. There is at least one x_1 for which if x_1 drinks water, then x_1 is a lawyer.
For all x_1, if x_1 makes tea, then x_1 is a lawyer can be inferred via the universal transitivity rule.