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: Richard is poor. For all x_24, if x_24 were a carpenter, then x_24 is an astronaut. For all x_24, x_24 will sleep or x_24 is a carpenter. For all x_24, if x_24 sleeps, then x_24 is an astronaut.
For all x_24, x_24 is an astronaut can be inferred via the universal disjunction elimination rule.