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: There is at least one x_6 for which x_6 will not drive a car. For all x_6, if x_6 were an artist, then x_6 is driving a car. For all x_6, x_6 is an artist if and only if x_6 will listen to a song.
There is at least one x_6 for which x_6 is not an artist can be inferred via the existential modus tollens rule. For all x_6, if x_6 were an artist, then x_6 is listening to a song can be inferred via the universal biconditional elimination rule. For all x_6, if x_6 listens to a song, then x_6 is an artist can be inferred via the universal biconditional elimination rule.