Consider the following premises. For all x_10, x_10 is a mechanic. For all x_10, x_10 is poor or x_10 will write a letter. For all x_10, if x_10 were curious, then x_10 is a scientist. For all x_10, if x_10 writes a letter, then x_10 is working. For all x_10, if x_10 works, then x_10 is a scientist. For all x_10, if x_10 were poor, then x_10 is working. Can we infer the following from them? For all x_10, x_10 is a mechanic and x_10 is a scientist.
 From the fact that for all x_10, if x_10 were poor, then x_10 is working, that for all x_10, if x_10 writes a letter, then x_10 is working, and that for all x_10, x_10 is poor or x_10 will write a letter we can infer that for all x_10, x_10 will work. From the fact that for all x_10, x_10 will work we can infer that for all x_10, x_10 will work or x_10 is curious. From the fact that for all x_10, if x_10 works, then x_10 is a scientist, that for all x_10, if x_10 were curious, then x_10 is a scientist, and that for all x_10, x_10 will work or x_10 is curious we can infer that for all x_10, x_10 is a scientist. Finally, from the fact that for all x_10, x_10 is a mechanic, and that for all x_10, x_10 is a scientist we can infer that for all x_10, x_10 is a mechanic and x_10 is a scientist. Therefore, the answer is yes.