Consider the following premises. If John were fast, then Jessica is a doctor. For all x_14, x_14 is a server if and only if x_14 is a doctor. If Jennifer were a scientist, then John is fast. Can we infer the following from them? If we can, name the inference rule being used: The fact that Jennifer were a scientist does not imply that Jessica is a server.
That contradicts the premises. Therefore the answer is no.