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: Charles is not a cashier. For all x_5, x_5 will not listen to a song or x_5 will play squash. For all x_5, x_5 will listen to a song or x_5 is a cashier.
For all x_5, x_5 is a cashier or x_5 will play squash can be inferred via the universal resolution rule.