Consider the following premises. For all x_12, if x_12 were fast, then x_12 is making tea. For all x_12, x_12 will sleep. For all x_12, if x_12 works, then x_12 is making tea. There is at least one x_12 for which x_12 will work or x_12 is a nurse. For all x_12, if x_12 were a nurse, then x_12 is fast. Can we infer the following from them? There is at least one x_12 for which x_12 will sleep.
 From the fact that for all x_12, if x_12 were a nurse, then x_12 is fast, and that for all x_12, if x_12 were fast, then x_12 is making tea we can infer that for all x_12, if x_12 were a nurse, then x_12 is making tea. From the fact that for all x_12, if x_12 works, then x_12 is making tea, that for all x_12, if x_12 were a nurse, then x_12 is making tea, and that there is at least one x_12 for which x_12 will work or x_12 is a nurse we can infer that there is at least one x_12 for which x_12 will make tea. From the fact that for all x_12, x_12 will sleep, and that there is at least one x_12 for which x_12 will make tea we can infer that there is at least one x_12 for which x_12 will sleep and x_12 will make tea. Finally, from the fact that there is at least one x_12 for which x_12 will sleep and x_12 will make tea we can infer that there is at least one x_12 for which x_12 will sleep. Therefore, the answer is yes.