What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_16, if x_16 listens to a song, then x_16 is sad. There is at least one x_16 for which if x_16 sleeps, then x_16 is not running. For all x_16, x_16 will climb a mountain if and only if x_16 is sad. For all x_16, if x_16 climbs a mountain, then x_16 is running. For all x_16, x_16 will listen to a song.
For all x_16, x_16 is sad. For all x_16, if x_16 climbs a mountain, then x_16 is sad. For all x_16, if x_16 were sad, then x_16 is climbing a mountain.