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 will not listen to a song or x_13 will work. For all x_13, x_13 will go running. There is at least one x_13 for which x_13 is not a writer. For all x_13, x_13 will listen to a song or x_13 is a writer.
For all x_13, x_13 is a writer or x_13 will work can be inferred via the universal resolution rule.