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, x_16 will sleep if and only if x_16 will listen to a song. If David cooks, then Karen is listening to a song. David is cooking or Karen is sleeping. If Karen listens to a song, then David is working.
If Karen climbs a mountain, then David is cooking. For all x_16, if x_16 sleeps, then x_16 is listening to a song. For all x_16, if x_16 listens to a song, then x_16 is sleeping.