Consider the following premises. For all x_12, x_12 will cook or x_12 is a doctor. For all x_12, x_12 will make tea if and only if x_12 is an electrician. For all x_12, if x_12 cooks, then x_12 is an astronaut. For all x_12, if x_12 were an astronaut, then x_12 is an electrician. For all x_12, if x_12 were a doctor, then x_12 is an astronaut. Can we infer the following from them? There is at least one x_12 for which x_12 will not make tea.
 From the fact that for all x_12, x_12 will make tea if and only if x_12 is an electrician we can infer that for all x_12, if x_12 were an electrician, then x_12 is making tea. From the fact that for all x_12, if x_12 cooks, then x_12 is an astronaut, that for all x_12, if x_12 were a doctor, then x_12 is an astronaut, and that for all x_12, x_12 will cook or x_12 is a doctor we can infer that for all x_12, x_12 is an astronaut. From the fact that for all x_12, if x_12 were an astronaut, then x_12 is an electrician, and that for all x_12, x_12 is an astronaut we can infer that for all x_12, x_12 is an electrician. Finally, from the fact that for all x_12, if x_12 were an electrician, then x_12 is making tea, and that for all x_12, x_12 is an electrician we can infer that for all x_12, x_12 will make tea, which contradicts that There is at least one x_12 for which x_12 will not make tea. Therefore, the answer is no.