15. The method according to claim 13 , further comprising: calculating a similarity set of documents such that a document is a member in the set if exists another document in the set, such that the similarity level between the two documents is at least TH %.
15. The method according to claim 13 , further comprising: calculating a similarity set of documents such that a document is a member in the set if exists another document in the set, such that the similarity level between the two documents is at least TH %. 16. The method according to claim 15 , applicable to version control.