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, if x_8 were a writer, then x_8 is a musician. For all x_8, x_8 is a writer if and only if x_8 is a janitor. For all x_8, x_8 is not a musician.
For all x_8, x_8 is not a writer. For all x_8, if x_8 were a writer, then x_8 is a janitor. For all x_8, if x_8 were a janitor, then x_8 is a writer.