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 y, if y sleeps, then y is a writer. For all y, if y were an artist, then y is a writer. For all y, if y makes tea, then y is not a writer. For all y, y is an artist or y will sleep.
For all y, y is a writer can be inferred via the universal disjunction elimination rule.