What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, if x_9 drinks water, then x_9 is listening to a song. For all x_9, if x_9 were happy, then x_9 is drinking water. For all x_9, if x_9 drinks water, then x_9 is happy. For all x_9, if x_9 listens to a song, then x_9 is happy.
For all x_9, if x_9 drinks water, then x_9 is happy. For all x_9, if x_9 were happy, then x_9 is listening to a song. For all x_9, if x_9 listens to a song, then x_9 is drinking water. For all x_9, x_9 is happy if and only if x_9 will drink water. For all x_9, x_9 will drink water if and only if x_9 is happy.