Consider the following premises. For all x_19, x_19 is not happy. Barbara is happy or it is sunny. Michael is a server if and only if it is cold. If it is cold, then it is not sunny. Can we infer the following from them? Michael is not a server.
 From the fact that for all x_19, x_19 is not happy we can infer that Barbara is not happy. From the fact that Barbara is happy or it is sunny, and that Barbara is not happy we can infer that it is sunny. From the fact that if it is cold, then it is not sunny, and that it is sunny we can infer that it is not cold. Finally, from the fact that Michael is a server if and only if it is cold, and that it is not cold we can infer that Michael is not a server. Therefore, the answer is yes.