Consider the following premises. For all x_10, x_10 will take a plane. For all x_10, if x_10 were a lawyer, then x_10 is happy. For all x_10, x_10 is a doctor. There is at least one x_10 for which if x_10 were a doctor, then x_10 is happy. Can we infer the following from them? For all x_10, either x_10 is happy or x_10 will take a plane are not true.
 From the fact that for all x_10, x_10 is a doctor we can infer that for all x_10, x_10 is a doctor or x_10 is a lawyer. From the fact that there is at least one x_10 for which if x_10 were a doctor, then x_10 is happy, that for all x_10, if x_10 were a lawyer, then x_10 is happy, and that for all x_10, x_10 is a doctor or x_10 is a lawyer we can infer that there is at least one x_10 for which x_10 is happy. Finally, from the fact that there is at least one x_10 for which x_10 is happy, and that for all x_10, x_10 will take a plane we can infer that there is at least one x_10 for which x_10 is happy and x_10 will take a plane, which contradicts that For all x_10, either x_10 is happy or x_10 will take a plane are not true. Therefore, the answer is no.