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_9, x_9 will climb a mountain or x_9 will sleep. For all x_9, if x_9 reads a book, then x_9 is taking a plane. For all x_9, if x_9 makes tea, then x_9 is taking a plane. For all x_9, x_9 will not sleep or x_9 will read a book. For all x_9, x_9 will not climb a mountain or x_9 will make tea.
For all x_9, x_9 will sleep or x_9 will make tea can be inferred via the universal resolution rule.