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_22, x_22 is a cashier or x_22 will make tea. If Sarah were a lawyer, then Michael is writing a letter. For all x_22, if x_22 were a cashier, then x_22 is a lawyer. For all x_22, if x_22 makes tea, then x_22 is a lawyer.
For all x_22, x_22 is a lawyer can be inferred via the universal disjunction elimination rule.