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_11, x_11 will cook or x_11 will not sleep. For all x_11, if x_11 reads a book, then x_11 is cooking. There is at least one x_11 for which x_11 will read a book or x_11 will sleep. For all x_11, if x_11 were a nurse, then x_11 is not cooking.
For all x_11, if x_11 sleeps, then x_11 is cooking can be inferred via the universal rewriting rule.