Consider the following premises. Mary is not an artist. For all y, y will play tennis if and only if y is an artist. For all x_20, x_20 is excited. Can we infer the following from them? Mary is playing tennis.
 From the fact that for all x_20, x_20 is excited we can infer that Jessica is excited. From the fact that for all y, y will play tennis if and only if y is an artist we can infer that Mary is playing tennis if and only if Mary is an artist. Finally, from the fact that Mary is playing tennis if and only if Mary is an artist, and that Mary is not an artist we can infer that Mary is not playing tennis, which contradicts that Mary is playing tennis. Therefore, the answer is no.