What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 is a sailor. There is at least one x_4 for which if x_4 sleeps, then x_4 is listening to a song. For all x_4, x_4 will sleep.
There is at least one x_4 for which x_4 will listen to a song. For all x_4, x_4 is a sailor and x_4 will sleep. For all x_4, x_4 will sleep and x_4 is a sailor.