Consider the following premises. For all x_10, if x_10 plays squash, then x_10 is taking a plane. Linda is not taking a plane. For all x_10, if x_10 takes a plane, then x_10 is playing squash. Can we infer the following from them? Linda is not playing squash.
 From the fact that for all x_10, if x_10 plays squash, then x_10 is taking a plane, and that for all x_10, if x_10 takes a plane, then x_10 is playing squash we can infer that for all x_10, x_10 will play squash if and only if x_10 will take a plane. From the fact that for all x_10, x_10 will play squash if and only if x_10 will take a plane we can infer that for all x_10, if x_10 plays squash, then x_10 is taking a plane. From the fact that for all x_10, if x_10 plays squash, then x_10 is taking a plane we can infer that if Linda plays squash, then Linda is taking a plane. Finally, from the fact that if Linda plays squash, then Linda is taking a plane, and that Linda is not taking a plane we can infer that Linda is not playing squash. Therefore, the answer is yes.