Consider the following premises. For all x_7, x_7 will play squash or x_7 will take a plane. For all x_7, x_7 will take a plane if and only if x_7 will work. For all x_7, if x_7 plays squash, then x_7 is working. Can we infer the following from them? There is at least one x_7 for which neither x_7 will work nor x_7 will cook.
 From the fact that for all x_7, x_7 will take a plane if and only if x_7 will work we can infer that for all x_7, if x_7 takes a plane, then x_7 is working. From the fact that for all x_7, if x_7 plays squash, then x_7 is working, that for all x_7, if x_7 takes a plane, then x_7 is working, and that for all x_7, x_7 will play squash or x_7 will take a plane we can infer that for all x_7, x_7 will work. Finally, from the fact that for all x_7, x_7 will work we can infer that for all x_7, x_7 will work or x_7 will cook, which contradicts that There is at least one x_7 for which neither x_7 will work nor x_7 will cook. Therefore, the answer is no.