Consider the following premises. Elisabeth is not curious. Joseph is cooking if and only if Elisabeth is curious. For all x_7, x_7 will cook if and only if x_7 will take a plane. Can we infer the following from them? Joseph is taking a plane.
 From the fact that for all x_7, x_7 will cook if and only if x_7 will take a plane we can infer that Joseph is cooking if and only if Joseph is taking a plane. From the fact that Joseph is cooking if and only if Elisabeth is curious, and that Elisabeth is not curious we can infer that Joseph is not cooking. Finally, from the fact that Joseph is cooking if and only if Joseph is taking a plane, and that Joseph is not cooking we can infer that Joseph is not taking a plane, which contradicts that Joseph is taking a plane. Therefore, the answer is no.