And even with the right algorithm, we had to be very careful with our early experiments, because if we got any of these factors wrong, there was no way to tell what the problem was.
E, mesmo com o algoritmo adequado, tivemos que ter muito cuidado  com as nossas primeiras experiências, porque, se considerássemos erradamente  qualquer destes fatores, não tínhamos forma de saber  qual era o problema.