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_5, if x_5 were a nurse, then x_5 is a soldier. For all x_5, if x_5 were a soldier, then x_5 is poor. For all x_5, if x_5 were poor, then x_5 is a doctor. For all x_5, if x_5 were a doctor, then x_5 is a server.
For all x_5, if x_5 were a nurse, then x_5 is poor can be inferred via the universal transitivity rule. For all x_5, if x_5 were a soldier, then x_5 is a doctor can be inferred via the universal transitivity rule. For all x_5, if x_5 were poor, then x_5 is a server can be inferred via the universal transitivity rule.