What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 is not a server. For all x_6, x_6 is an office clerk. For all x_6, x_6 is not an office clerk or x_6 is a server. There is at least one x_6 for which x_6 will not drive a car or x_6 will climb a mountain.
Nothing can be inferred from these premises.