What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, if x_4 were an artist, then x_4 is not writing a letter. There is at least one x_4 for which x_4 will work or x_4 will write a letter. For all x_4, x_4 will not work.
There is at least one x_4 for which x_4 will write a letter.