Zippi, the adventurous robot, sets out on a new epic underwater journey in search of the meaning of the letter 'D'. Along the way, he encounters mysterious sea creatures, treacherous waters, and unexpected challenges. With his sharp mind and unwavering spirit, Zippi shows perseverance and bravery to overcome any obstacle that stands in his way. Will he uncover the secret of the letter 'D' and return home safely? Find out in the fourth book of the 'Zippi's Alphabet Intelligence' series.
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