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, x_3 will drink water. For all x_3, x_3 will take a plane.
For all x_3, x_3 will drink water and x_3 will take a plane can be inferred via the universal conjunction rule. For all x_3, x_3 will take a plane and x_3 will drink water can be inferred via the universal conjunction rule.