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How Do You Spell IMPROVED UPON?

Correct spelling for the English word "improved upon" is [ɪmpɹˈuːvd əpˌɒn], [ɪmpɹˈuːvd əpˌɒn], [ɪ_m_p_ɹ_ˈuː_v_d ə_p_ˌɒ_n] (IPA phonetic alphabet).

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