... preprocessing simply in- cluded down-casing, separating punctuation fromwords and splitting off “’s”.OOV Handling Techniques and their Combina-tion We compare our baseline system (BASELINE)to ... Orthographically, wedistinguish three major challenges for Arabic pro-cessing. First, Arabic script uses optional vocalicdiacritics. Second, certain letters in Arabic scriptare often spelled inconsistently, ... morpholog-ically related to in- vocabulary (INV) words (Yangand Kirchhoff, 2006). Vilar et al. (2007) addressspelling-variant OOVs in MT through online re-tokenization into letters and combination with aword-based...