Consider the following premises. For all x_7, if x_7 sleeps, then x_7 is drinking water. For all x_7, if x_7 were happy, then x_7 is sleeping. There is at least one x_7 for which x_7 is happy or x_7 will not drink water. Can we infer the following from them? For all x_7, if is not true that x_7 is happy if and only if x_7 will drink water.
 From the fact that there is at least one x_7 for which x_7 is happy or x_7 will not drink water we can infer that there is at least one x_7 for which if x_7 drinks water, then x_7 is happy. From the fact that for all x_7, if x_7 were happy, then x_7 is sleeping, and that for all x_7, if x_7 sleeps, then x_7 is drinking water we can infer that for all x_7, if x_7 were happy, then x_7 is drinking water. Finally, from the fact that for all x_7, if x_7 were happy, then x_7 is drinking water, and that there is at least one x_7 for which if x_7 drinks water, then x_7 is happy we can infer that there is at least one x_7 for which x_7 is happy if and only if x_7 will drink water, which contradicts that For all x_7, if is not true that x_7 is happy if and only if x_7 will drink water. Therefore, the answer is no.