Consider the following premises. For all x_11, if x_11 were a cashier, then x_11 is not playing squash. For all x_11, x_11 is bored or x_11 will play squash. For all x_11, x_11 is not a musician. For all x_11, x_11 is a cashier or x_11 is a sailor. For all x_11, x_11 is a musician if and only if x_11 is bored. Can we infer the following from them? For all x_11, x_11 is a sailor.
 From the fact that for all x_11, x_11 is a musician if and only if x_11 is bored, and that for all x_11, x_11 is not a musician we can infer that for all x_11, x_11 is not bored. From the fact that for all x_11, x_11 is bored or x_11 will play squash, and that for all x_11, x_11 is not bored we can infer that for all x_11, x_11 will play squash. From the fact that for all x_11, if x_11 were a cashier, then x_11 is not playing squash, and that for all x_11, x_11 will play squash we can infer that for all x_11, x_11 is not a cashier. Finally, from the fact that for all x_11, x_11 is a cashier or x_11 is a sailor, and that for all x_11, x_11 is not a cashier we can infer that for all x_11, x_11 is a sailor. Therefore, the answer is yes.