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_8 for which x_8 is fast if and only if x_8 is an artist. For all x_8, x_8 will not listen to a song. For all x_8, x_8 will listen to a song if and only if x_8 is an artist.
For all x_8, if x_8 listens to a song, then x_8 is an artist can be inferred via the universal biconditional elimination rule. There is at least one x_8 for which if x_8 were fast, then x_8 is an artist can be inferred via the existential biconditional elimination rule. For all x_8, if x_8 were an artist, then x_8 is listening to a song can be inferred via the universal biconditional elimination rule. There is at least one x_8 for which if x_8 were an artist, then x_8 is fast can be inferred via the existential biconditional elimination rule. For all x_8, x_8 is not an artist can be inferred via the universal biconditional elimination rule.