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_3, if x_3 takes a plane, then x_3 is a lawyer. For all x_3, if x_3 drinks water, then x_3 is taking a plane. For all x_3, x_3 will drink water. There is at least one x_3 for which if x_3 were an office clerk, then x_3 is a lawyer.
For all x_3, x_3 will take a plane can be inferred via the universal modus ponens rule. For all x_3, if x_3 drinks water, then x_3 is a lawyer can be inferred via the universal transitivity rule.