What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, x_8 is a taxi driver if and only if x_8 is a musician. For all x_8, x_8 is a musician. There is at least one x_8 for which if x_8 listens to a song, then x_8 is not a taxi driver.
For all x_8, if x_8 were a taxi driver, then x_8 is a musician. For all x_8, if x_8 were a musician, then x_8 is a taxi driver.