What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 will read a book. For all x_9, x_9 is happy or x_9 is an astronaut. For all x_9, if x_9 were an astronaut, then x_9 is working. For all x_9, x_9 will work or x_9 is not happy.
For all x_9, if x_9 were happy, then x_9 is working.