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Textual criticism resolves questions arising from the variations between texts: put another way, it seeks to decide the most reliable wording of a text. Ancient scribes made errors or alterations (such as including non-authentic additions). In attempting to determine the original text of the New Testament books, some modern textual critics have identified sections as additions of material, centuries after the gospel was written. These are called interpolations. In modern translations of the Bible, the results of textual criticism have led to certain verses, words and phrases being left out or marked as not original.