|  | Diacritics | 
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 By adding diacritic marks, you can modify the sound of some hiragana characters. 
 Click on each box and hear how the diacritical marks change the sound of each hiragana column. じ and ぢ have the same /ji/ sound as in jeep (not /di/ as in deep). Also, ず and づ have the same /zu/ sound as in zoo (not /du/ as in do). However, these are not interchangeable characters. There is only one correct spelling for each word. In general, じ and ず are used more commonly than ぢ and づ. 
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