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_7, if x_7 were a cashier, then x_7 is not an electrician. There is at least one x_7 for which x_7 is a cashier or x_7 is a janitor. For all x_7, x_7 is an electrician and x_7 will make tea.
For all x_7, x_7 is an electrician can be inferred via the universal simplification rule. For all x_7, x_7 will make tea can be inferred via the universal simplification rule.