Consider the following premises. There is at least one x_10 for which if x_10 were a cashier, then x_10 is an artist. For all x_10, x_10 is a cashier or x_10 is not an artist. For all x_10, if x_10 were an artist, then x_10 is a cashier. Can we infer the following from them? There is at least one x_10 for which x_10 is a cashier if and only if x_10 is an artist.
Yes.