Consider the following premises. There is at least one x_10 for which x_10 is not a mechanic or x_10 is a janitor. For all x_10, if x_10 listens to a song, then x_10 is a musician. For all x_10, x_10 will read a book or x_10 will listen to a song. For all x_10, if x_10 reads a book, then x_10 is a musician. For all x_10, if x_10 were a musician, then x_10 is a mechanic. Can we infer the following from them? If we can, name the inference rule being used: There is at least one x_10 for which x_10 will take a plane or x_10 is a janitor.
 From the fact that for all x_10, if x_10 reads a book, then x_10 is a musician, that for all x_10, if x_10 listens to a song, then x_10 is a musician, and that for all x_10, x_10 will read a book or x_10 will listen to a song we can infer that for all x_10, x_10 is a musician via universal disjunction elimination. From the fact that for all x_10, if x_10 were a musician, then x_10 is a mechanic, and that for all x_10, x_10 is a musician we can infer that for all x_10, x_10 is a mechanic via universal modus ponens. From the fact that for all x_10, x_10 is a mechanic we can infer that for all x_10, x_10 is a mechanic or x_10 will take a plane via universal addition. Finally, from the fact that for all x_10, x_10 is a mechanic or x_10 will take a plane, and that there is at least one x_10 for which x_10 is not a mechanic or x_10 is a janitor we can infer that there is at least one x_10 for which x_10 will take a plane or x_10 is a janitor via existential resolution. Therefore, the answer is yes.