Consider the following premises. There is at least one x_13 for which x_13 will drink water or x_13 will take a plane. For all x_13, if x_13 drinks water, then x_13 is a musician. For all x_13, x_13 will make tea and x_13 will sleep. For all x_13, if x_13 takes a plane, then x_13 is a musician. Can we infer the following from them? If we can, name the inference rule being used: Some musicians will make tea.
 From the fact that for all x_13, if x_13 drinks water, then x_13 is a musician, that for all x_13, if x_13 takes a plane, then x_13 is a musician, and that there is at least one x_13 for which x_13 will drink water or x_13 will take a plane we can infer that there is at least one x_13 for which x_13 is a musician via existential disjunction elimination. From the fact that for all x_13, x_13 will make tea and x_13 will sleep we can infer that for all x_13, x_13 will make tea via universal simplification. Finally, from the fact that there is at least one x_13 for which x_13 is a musician, and that for all x_13, x_13 will make tea we can infer that some musicians will make tea via existential conjunction. Therefore, the answer is yes.