What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, if x_9 were a lawyer, then x_9 is writing a letter. There is at least one x_9 for which if x_9 writes a letter, then x_9 is a writer. For all x_9, if x_9 were a musician, then x_9 is a lawyer. For all x_9, if x_9 were a writer, then x_9 is a musician.
For all x_9, if x_9 were a musician, then x_9 is writing a letter. For all x_9, if x_9 were a writer, then x_9 is a lawyer. There is at least one x_9 for which if x_9 writes a letter, then x_9 is a musician. There is at least one x_9 for which if x_9 were a lawyer, then x_9 is a writer.