15. The system of claim 13 , wherein determining the anchor comprises including a named entity as part of the anchor.
15. The system of claim 13 , wherein determining the anchor comprises including a named entity as part of the anchor. 18. The system of claim 15 , the operations further comprising: counting the number of unique anchors associated with each identified potential paraphrase pair to determine the quality of each potential paraphrase pair; and identifying potential paraphrase pairs that are associated with a larger number of anchors as being of higher quality than potential paraphrase pairs that are associated with a smaller number of anchors.