Consider the following premises. For all x_18, if x_18 climbs a mountain, then x_18 is writing a letter. For all x_18, x_18 will read a book or x_18 will climb a mountain. For all x_18, x_18 will listen to a song. There is at least one x_18 for which if x_18 reads a book, then x_18 is writing a letter. Can we infer the following from them? There is at least one x_18 for which x_18 will write a letter or x_18 will drive a car.
 From the fact that there is at least one x_18 for which if x_18 reads a book, then x_18 is writing a letter, that for all x_18, if x_18 climbs a mountain, then x_18 is writing a letter, and that for all x_18, x_18 will read a book or x_18 will climb a mountain we can infer that there is at least one x_18 for which x_18 will write a letter. From the fact that there is at least one x_18 for which x_18 will write a letter, and that for all x_18, x_18 will listen to a song we can infer that there is at least one x_18 for which x_18 will write a letter and x_18 will listen to a song. From the fact that there is at least one x_18 for which x_18 will write a letter and x_18 will listen to a song we can infer that there is at least one x_18 for which x_18 will write a letter. Finally, from the fact that there is at least one x_18 for which x_18 will write a letter we can infer that there is at least one x_18 for which x_18 will write a letter or x_18 will drive a car. Therefore, the answer is yes.