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A1 Hamad, Mohamed Satti. A2 Yassin, Abdalla ID 25482 OP pp. 1-18 T1 Investigating lexical errors and their effect on university students written performance in Sudan [Article] UL 1 http://search.shamaa.org/fulltext.gif http://www.sustech.edu/staff_publications/20150430072230693.pdf Full text (PDF)