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_8, x_8 is not happy. For all x_8, x_8 will not make tea or x_8 will take a plane. For all x_8, x_8 will not listen to a song or x_8 is happy. For all x_8, x_8 will listen to a song or x_8 will make tea.
For all x_8, x_8 will make tea or x_8 is happy can be inferred via the universal resolution rule.