Consider the following premises. For all x_10, x_10 will climb a mountain. For all x_10, x_10 is happy and x_10 will go running. For all x_10, x_10 is excited. Can we infer the following from them? There is at least one x_10 for which x_10 is not happy.
 From the fact that for all x_10, x_10 is excited, and that for all x_10, x_10 will climb a mountain we can infer that for all x_10, x_10 is excited and x_10 will climb a mountain. From the fact that for all x_10, x_10 is excited and x_10 will climb a mountain we can infer that for all x_10, x_10 is excited. From the fact that for all x_10, x_10 is happy and x_10 will go running we can infer that for all x_10, x_10 is happy. From the fact that for all x_10, x_10 is happy, and that for all x_10, x_10 is excited we can infer that for all x_10, x_10 is happy and x_10 is excited. Finally, from the fact that for all x_10, x_10 is happy and x_10 is excited we can infer that for all x_10, x_10 is happy, which contradicts that There is at least one x_10 for which x_10 is not happy. Therefore, the answer is no.