Consider the following premises. For all x_13, if x_13 were a soldier, then x_13 is making tea. For all x_13, if x_13 were a sailor, then x_13 is a soldier. For all x_13, if x_13 makes tea, then x_13 is not running. Elisabeth is running. Can we infer the following from them? If we can, name the inference rule being used: For all x_13, x_13 is a sailor.
 From the fact that Elisabeth is running we can infer that there is at least one x_13 for which x_13 will go running via existential generalization. From the fact that for all x_13, if x_13 were a sailor, then x_13 is a soldier, and that for all x_13, if x_13 were a soldier, then x_13 is making tea we can infer that for all x_13, if x_13 were a sailor, then x_13 is making tea via universal transitivity. From the fact that for all x_13, if x_13 makes tea, then x_13 is not running, and that there is at least one x_13 for which x_13 will go running we can infer that there is at least one x_13 for which x_13 will not make tea via existential modus tollens. Finally, from the fact that for all x_13, if x_13 were a sailor, then x_13 is making tea, and that there is at least one x_13 for which x_13 will not make tea we can infer that there is at least one x_13 for which x_13 is not a sailor via existential modus tollens, which contradicts that For all x_13, x_13 is a sailor. Therefore, the answer is no.