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about +   blindness +   brain +   children +   count +   counting +   difficulties +   dyscalculia +   education +   from +   have +   into +   many +   math +   mathematical +   mathematics +   number +   numbers +   objects +   page +   part +   sense +   some +   students +   than +   that +   their +   these +   They +   this +   thr +   understanding +   what +   with +