Consider the following premises. For all x_14, if x_14 were a mechanic, then x_14 is taking a plane. There is at least one x_14 for which x_14 is excited or x_14 will go running. For all x_14, if x_14 were excited, then x_14 is a mechanic. For all x_14, x_14 will not take a plane. Can we infer the following from them? There is at least one x_14 for which x_14 will go running or x_14 will write a letter.
 From the fact that for all x_14, if x_14 were a mechanic, then x_14 is taking a plane, and that for all x_14, x_14 will not take a plane we can infer that for all x_14, x_14 is not a mechanic. From the fact that for all x_14, if x_14 were excited, then x_14 is a mechanic, and that for all x_14, x_14 is not a mechanic we can infer that for all x_14, x_14 is not excited. From the fact that there is at least one x_14 for which x_14 is excited or x_14 will go running, and that for all x_14, x_14 is not excited we can infer that there is at least one x_14 for which x_14 will go running. Finally, from the fact that there is at least one x_14 for which x_14 will go running we can infer that there is at least one x_14 for which x_14 will go running or x_14 will write a letter. Therefore, the answer is yes.