Consider the following premises. There is at least one x_5 for which if x_5 were happy, then x_5 is an artist. For all x_5, x_5 is an artist if and only if x_5 is happy. For all x_5, x_5 is not happy. Can we infer the following from them? There is at least one x_5 for which x_5 is not an artist.
 From the fact that for all x_5, x_5 is an artist if and only if x_5 is happy we can infer that for all x_5, if x_5 were an artist, then x_5 is happy. From the fact that there is at least one x_5 for which if x_5 were happy, then x_5 is an artist, and that for all x_5, if x_5 were an artist, then x_5 is happy we can infer that there is at least one x_5 for which x_5 is happy if and only if x_5 is an artist. Finally, from the fact that there is at least one x_5 for which x_5 is happy if and only if x_5 is an artist, and that for all x_5, x_5 is not happy we can infer that there is at least one x_5 for which x_5 is not an artist. Therefore, the answer is yes.