What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, x_5 is not a soldier. For all x_5, x_5 will go running. For all x_5, x_5 is a soldier if and only if x_5 will go running.
Since the premises are contradictory, we can infer anything from them.