Generate a question that has the following answer: Seventeen years later, each of the girls has moved on. for the following movie plot: Six teenage girls are boarders in a school where they are terrorised by a fearsome nun. When she discovers that one of the girls is pregnant, the nun tries to purify her. The girls watch as their friend is tortured and decide to inetervene. The nun was never seen again.Seventeen years later, each of the girls has moved on. But one night, one of them is brutally murdered. Then another, They know she has returned, and is seeking revenge. The only way to triumph over the nun is to return to the place where it all began all those years ago - the boarding school.
The answer to this question is:
how many years of girls moved?