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 a carpenter, then x_4 is an office clerk. For all x_4, x_4 is not a carpenter. There is at least one x_4 for which x_4 is a carpenter or x_4 is not an office clerk.
There is at least one x_4 for which if x_4 were an office clerk, then x_4 is a carpenter.