Consider the following premises. If it is late, then John is a server. For all y, if y were a server, then y is an artist. Mary is a soldier. If John were an artist, then Mary is not a soldier. Can we infer the following from them? It is late.
 From the fact that for all y, if y were a server, then y is an artist we can infer that if John were a server, then John is an artist. From the fact that if John were an artist, then Mary is not a soldier, and that Mary is a soldier we can infer that John is not an artist. From the fact that if it is late, then John is a server, and that if John were a server, then John is an artist we can infer that if it is late, then John is an artist. Finally, from the fact that if it is late, then John is an artist, and that John is not an artist we can infer that it is not late, which contradicts that It is late. Therefore, the answer is no.