What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_9 for which x_9 is a lawyer if and only if x_9 will write a letter. For all x_9, x_9 will not write a letter. For all x_9, if x_9 listens to a song, then x_9 is a lawyer.
There is at least one x_9 for which 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 lawyer. There is at least one x_9 for which x_9 is not a lawyer.