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 writes a letter, then x_9 is an artist. There is at least one x_9 for which if x_9 were an artist, then x_9 is writing a letter. For all x_9, x_9 is not an artist. For all x_9, x_9 will go running if and only if x_9 will write a letter.
For all x_9, x_9 will not write a letter. There is at least one x_9 for which x_9 is an artist if and only if x_9 will write a letter. There is at least one x_9 for which x_9 will write a letter if and only if x_9 is an artist. For all x_9, if x_9 goes running, then x_9 is writing a letter. For all x_9, if x_9 writes a letter, then x_9 is running.