The spelling of "NDUO" represents a challenging task for both spellers and linguists. It is a word that lacks clear phonetic support, as the phonemes comprising the word do not neatly correspond to their spelling. In IPA notation, "NDUO" is transcribed as /ən.du.oʊ/, with the schwa sound occurring before the consonants. The unorthodox spelling of "NDUO" underscores the challenge of accurately representing oral language in written form. Therefore, it is critical to keep in mind the underlying phonemes when attempting to spell or pronounce this tricky word.