Consider the following premises. For all x_11, x_11 is a taxi driver if and only if x_11 is an artist. There is at least one x_11 for which if x_11 takes a plane, then x_11 is an artist. For all x_11, if x_11 were a taxi driver, then x_11 is taking a plane. Can we infer the following from them? There is at least one x_11 for which if x_11 were a taxi driver, then x_11 is an artist.
 From the fact that for all x_11, x_11 is a taxi driver if and only if x_11 is an artist we can infer that for all x_11, if x_11 were an artist, then x_11 is a taxi driver. Finally, from the fact that for all x_11, if x_11 were a taxi driver, then x_11 is taking a plane, and that there is at least one x_11 for which if x_11 takes a plane, then x_11 is an artist we can infer that there is at least one x_11 for which if x_11 were a taxi driver, then x_11 is an artist. Therefore, the answer is yes.