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 will sleep if and only if x_6 is an office clerk. For all x_6, if x_6 sleeps, then x_6 is an office clerk. For all x_6, x_6 is not a sailor. For all x_6, if x_6 sleeps, then x_6 is a sailor.
For all x_6, x_6 will not sleep. For all x_6, if x_6 sleeps, then x_6 is an office clerk. For all x_6, if x_6 were an office clerk, then x_6 is sleeping.