What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_3, y_3 is a scientist or y_3 is not a soldier. For all y_3, if y_3 were an office clerk, then y_3 is a soldier. For all y_3, if y_3 were a scientist, then y_3 is an office clerk.
For all y_3, if y_3 were a scientist, then y_3 is a soldier. For all y_3, if y_3 were a soldier, then y_3 is a scientist.