What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, x_15 will not sleep. For all x_15, x_15 is sad or x_15 will listen to a song. For all x_15, x_15 is not sad or x_15 will drink water. There is at least one x_15 for which x_15 will sleep or x_15 is a taxi driver. For all x_15, x_15 will not listen to a song.
There is at least one x_15 for which x_15 is a taxi driver. For all x_15, x_15 will listen to a song or x_15 will drink water.