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_4 for which x_4 will listen to a song or x_4 is not a musician. For all x_4, if x_4 listens to a song, then x_4 is a musician.
There is at least one x_4 for which if x_4 were a musician, then x_4 is listening to a song can be inferred via the existential rewriting rule.