Consider the following premises. For all x_15, if x_15 takes a plane, then x_15 is not working. For all x_15, x_15 will not play a game. There is at least one x_15 for which x_15 is an office clerk if and only if x_15 is a bartender. For all x_15, x_15 will take a plane or x_15 is a bartender. For all x_15, x_15 will play a game or x_15 will work. Can we infer the following from them? For all x_15, x_15 is not an office clerk.
 From the fact that for all x_15, x_15 will play a game or x_15 will work, and that for all x_15, x_15 will not play a game we can infer that for all x_15, x_15 will work. From the fact that for all x_15, if x_15 takes a plane, then x_15 is not working, and that for all x_15, x_15 will work we can infer that for all x_15, x_15 will not take a plane. From the fact that there is at least one x_15 for which x_15 is an office clerk if and only if x_15 is a bartender we can infer that there is at least one x_15 for which if x_15 were a bartender, then x_15 is an office clerk. From the fact that for all x_15, x_15 will take a plane or x_15 is a bartender, and that for all x_15, x_15 will not take a plane we can infer that for all x_15, x_15 is a bartender. Finally, from the fact that there is at least one x_15 for which if x_15 were a bartender, then x_15 is an office clerk, and that for all x_15, x_15 is a bartender we can infer that there is at least one x_15 for which x_15 is an office clerk, which contradicts that For all x_15, x_15 is not an office clerk. Therefore, the answer is no.