What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_7, x_7 will listen to a song. For all x_7, x_7 is a server if and only if x_7 is an artist. For all x_7, x_7 will not listen to a song or x_7 is a server. There is at least one x_7 for which if x_7 drives a car, then x_7 is an artist.
For all x_7, if x_7 were a server, then x_7 is an artist can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were an artist, then x_7 is a server can be inferred via the universal biconditional elimination rule.