What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_14, if x_14 were a server, then x_14 is listening to a song. There is at least one x_14 for which x_14 will listen to a song or x_14 will write a letter. For all x_14, x_14 is not a server. For all x_14, if x_14 listens to a song, then x_14 is a server.
For all x_14, x_14 will not listen to a song. For all x_14, x_14 is a server if and only if x_14 will listen to a song. For all x_14, x_14 will listen to a song if and only if x_14 is a server.