Consider the following premises. For all x_13, x_13 will not take a plane or x_13 is happy. There is at least one x_13 for which x_13 is sad. For all x_13, if x_13 were sad, then x_13 is taking a plane. For all x_13, if x_13 listens to a song, then x_13 is taking a plane. Can we infer the following from them? There is at least one x_13 for which x_13 is a poet or x_13 is happy.
 From the fact that there is at least one x_13 for which x_13 is sad we can infer that there is at least one x_13 for which x_13 is sad or x_13 will listen to a song. From the fact that for all x_13, if x_13 were sad, then x_13 is taking a plane, that for all x_13, if x_13 listens to a song, then x_13 is taking a plane, and that there is at least one x_13 for which x_13 is sad or x_13 will listen to a song we can infer that there is at least one x_13 for which x_13 will take a plane. From the fact that there is at least one x_13 for which x_13 will take a plane we can infer that there is at least one x_13 for which x_13 will take a plane or x_13 is a poet. Finally, from the fact that there is at least one x_13 for which x_13 will take a plane or x_13 is a poet, and that for all x_13, x_13 will not take a plane or x_13 is happy we can infer that there is at least one x_13 for which x_13 is a poet or x_13 is happy. Therefore, the answer is yes.