Consider the following premises. For all x_1, if x_1 reads a book, then x_1 is a politician. For all x_1, if x_1 takes a plane, then x_1 is a politician. For all x_1, if x_1 climbs a mountain, then x_1 is reading a book. There is at least one x_1 for which x_1 will take a plane or x_1 will climb a mountain. Can we infer the following from them? There is at least one x_1 for which x_1 is a politician.
 From the fact that for all x_1, if x_1 climbs a mountain, then x_1 is reading a book, and that for all x_1, if x_1 reads a book, then x_1 is a politician we can infer that for all x_1, if x_1 climbs a mountain, then x_1 is a politician. Finally, from the fact that for all x_1, if x_1 takes a plane, then x_1 is a politician, that for all x_1, if x_1 climbs a mountain, then x_1 is a politician, and that there is at least one x_1 for which x_1 will take a plane or x_1 will climb a mountain we can infer that there is at least one x_1 for which x_1 is a politician. Therefore, the answer is yes.