الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
Text Mining concerns the discovery of knowledge from unstructured textual data . One important task is the discovery of rules that relate specific words and phrases . Textual entries in many data base fields exhibit minor variations that may cause the production of non-reliable patterns . variations can arise from typographical errors misspellings abbreviations as well as other sources like ambiguity Ambiguity may be due to the derivative feature the fact that different words may share the same word stem- which is very common in the Arabic language .