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_1, if y_1 were a poet, then y_1 is an astronaut. For all y_1, y_1 is a poet or y_1 is not an astronaut.
For all y_1, if y_1 were an astronaut, then y_1 is a poet can be inferred via the universal rewriting rule.