What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x for which if x were an astronaut, then x is sad. For all x, if x sleeps, then x is an astronaut. For all x, x will sleep.
For all x, x is an astronaut. There is at least one x for which if x sleeps, then x is sad.