Consider the following premises. For all x_6, if x_6 takes a plane, then x_6 is curious. For all x_6, x_6 will not cook or x_6 is a taxi driver. There is at least one x_6 for which x_6 will cook or x_6 will take a plane. For all x_6, x_6 is a taxi driver if and only if x_6 is curious. Can we infer the following from them? There is at least one x_6 for which x_6 is curious.
 From the fact that for all x_6, x_6 is a taxi driver if and only if x_6 is curious we can infer that for all x_6, if x_6 were a taxi driver, then x_6 is curious. From the fact that there is at least one x_6 for which x_6 will cook or x_6 will take a plane, and that for all x_6, x_6 will not cook or x_6 is a taxi driver we can infer that there is at least one x_6 for which x_6 will take a plane or x_6 is a taxi driver. Finally, from the fact that for all x_6, if x_6 takes a plane, then x_6 is curious, that for all x_6, if x_6 were a taxi driver, then x_6 is curious, and that there is at least one x_6 for which x_6 will take a plane or x_6 is a taxi driver we can infer that there is at least one x_6 for which x_6 is curious. Therefore, the answer is yes.