Consider the following premises. For all y, if y were a server, then y is playing squash. For all y, y is not an electrician. For all y, y is an electrician if and only if y will play squash. For all y, if y listens to a song, then y is a server. For all y, if y plays squash, then y is listening to a song. Can we infer the following from them? For all y, y is not a server.
 From the fact that for all y, if y plays squash, then y is listening to a song, and that for all y, if y listens to a song, then y is a server we can infer that for all y, if y plays squash, then y is a server. From the fact that for all y, if y plays squash, then y is a server, and that for all y, if y were a server, then y is playing squash we can infer that for all y, y will play squash if and only if y is a server. From the fact that for all y, y is an electrician if and only if y will play squash, and that for all y, y is not an electrician we can infer that for all y, y will not play squash. Finally, from the fact that for all y, y will play squash if and only if y is a server, and that for all y, y will not play squash we can infer that for all y, y is not a server. Therefore, the answer is yes.