dear friend, maybe i was not clear to give some explanations, anyway the task i need to do is regarding speech recongnition n language modelling. maybe is easy task but i tried n i faild. i have a corpus n i need to change all numbers there to words. im aged enough not to need to do excercies;) the first solution also ive tried before but it dosnt change all my numbers to words but some which i donno why... any idea?