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_4, if x_4 were a writer, then x_4 is making tea. For all x_4, if x_4 sleeps, then x_4 is making tea. For all x_4, x_4 will sleep or x_4 is a writer.
For all x_4, x_4 will make tea can be inferred via the universal disjunction elimination rule.