What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Mary is not a soldier. For all x_13, if x_13 works, then x_13 is cooking. Mary is a soldier if and only if Mary is working. For all x_13, if x_13 cooks, then x_13 is a soldier.
If Mary were a soldier, then Mary is working. If Mary works, then Mary is a soldier. For all x_13, if x_13 works, then x_13 is a soldier.