The waiting period of a woman divorced during her waiting period, other than the first divorce

Question:
If a woman is divorced during her waiting period with a divorce other than the first one, how is her waiting period determined?

Answer:
From the first divorce, if there was no intercourse after the first divorce. So, if he divorced her with one divorce, and then after a day or two, or a week or two, he divorced her with a second divorce, she begins her waiting period from the first one, if it was merely words. But if he took her back, she must observe the waiting period from the second one.