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_12, x_12 is a taxi driver. There is at least one x_12 for which if x_12 were a server, then x_12 is reading a book. For all x_12, x_12 is a server and x_12 will make tea.
For all x_12, x_12 is a server can be inferred via the universal simplification rule. For all x_12, x_12 will make tea can be inferred via the universal simplification rule.