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_13, x_13 is a cashier. For all x_13, x_13 is an electrician. For all x_13, if x_13 were a cashier, then x_13 is working.
For all x_13, x_13 will work can be inferred via the universal modus ponens rule. For all x_13, x_13 is a cashier and x_13 is an electrician can be inferred via the universal conjunction rule. For all x_13, x_13 is an electrician and x_13 is a cashier can be inferred via the universal conjunction rule.