What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, x is a sailor or x is not an astronaut. For all x, x is not a sailor. For all x, x is an astronaut or x is not a sailor.
For all x, if x were an astronaut, then x is a sailor. For all x, if x were a sailor, then x is an astronaut.