Consider the following premises. There is at least one x_6 for which x_6 will go running or x_6 is a scientist. For all x_6, if x_6 goes running, then x_6 is a mechanic. For all x_6, if x_6 were a nurse, then x_6 is a mechanic. For all x_6, x_6 is a nurse or x_6 is not a scientist. Can we infer the following from them? For all x_6, x_6 is not a mechanic.
 From the fact that for all x_6, x_6 is a nurse or x_6 is not a scientist we can infer that for all x_6, if x_6 were a scientist, then x_6 is a nurse. From the fact that for all x_6, if x_6 were a scientist, then x_6 is a nurse, and that for all x_6, if x_6 were a nurse, then x_6 is a mechanic we can infer that for all x_6, if x_6 were a scientist, then x_6 is a mechanic. Finally, from the fact that for all x_6, if x_6 goes running, then x_6 is a mechanic, that for all x_6, if x_6 were a scientist, then x_6 is a mechanic, and that there is at least one x_6 for which x_6 will go running or x_6 is a scientist we can infer that there is at least one x_6 for which x_6 is a mechanic, which contradicts that For all x_6, x_6 is not a mechanic. Therefore, the answer is no.