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_4, if y_4 reads a book, then y_4 is playing tennis. For all y_4, y_4 will not drive a car or y_4 is a sailor. For all y_4, y_4 will drive a car or y_4 will read a book. There is at least one y_4 for which y_4 will cook. For all y_4, if y_4 were a sailor, then y_4 is playing tennis.
For all y_4, y_4 will read a book or y_4 is a sailor can be inferred via the universal resolution rule.