Consider the following premises. For all x_13, x_13 will listen to a song or x_13 will play a game. For all x_13, if x_13 plays a game, then x_13 is a lawyer. For all x_13, if x_13 listens to a song, then x_13 is a lawyer. Jessica is taking a plane. Can we infer the following from them? If we can, name the inference rule being used: Some lawyers will take a plane.
 From the fact that for all x_13, if x_13 listens to a song, then x_13 is a lawyer, that for all x_13, if x_13 plays a game, then x_13 is a lawyer, and that for all x_13, x_13 will listen to a song or x_13 will play a game we can infer that for all x_13, x_13 is a lawyer via universal disjunction elimination. From the fact that Jessica is taking a plane we can infer that there is at least one x_13 for which x_13 will take a plane via existential generalization. Finally, from the fact that for all x_13, x_13 is a lawyer, and that there is at least one x_13 for which x_13 will take a plane we can infer that some lawyers will take a plane via existential conjunction. Therefore, the answer is yes.