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: Robert is making tea or it is raining. If it rains, then Robert is a poet. For all x_6, if x_6 were a server, then x_6 is a poet. For all x_6, if x_6 makes tea, then x_6 is a server.
For all x_6, if x_6 makes tea, then x_6 is a poet can be inferred via the universal transitivity rule.