What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_11 for which x_11 is a janitor. For all x_11, x_11 is a doctor if and only if x_11 is a soldier. For all x_11, if x_11 were a soldier, then x_11 is not a janitor.
There is at least one x_11 for which x_11 is not a soldier. For all x_11, if x_11 were a doctor, then x_11 is a soldier. For all x_11, if x_11 were a soldier, then x_11 is a doctor.