All but two of the sums are unique, and if the hallway number had matched any of these, Zara would have known the correct combination right then and there without asking for the third clue.
Todas as somas são diferentes, à exceção de duas. Se o número do corredor  correspondesse a qualquer destas, a Zara teria sabido logo ali qual a combinação correta sem precisar de pedir a terceira pista.