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 an electrician. For all x_5, x_5 is not an electrician. For all x_5, if x_5 were poor, then x_5 is a nurse. For all x_5, if x_5 were excited, then x_5 is poor.
For all x_5, x_5 is not a nurse can be inferred via the universal modus tollens rule. For all x_5, if x_5 were poor, then x_5 is an electrician can be inferred via the universal transitivity rule. For all x_5, if x_5 were excited, then x_5 is a nurse can be inferred via the universal transitivity rule.