The spelling of the word "viduka" can be explained using the International Phonetic Alphabet or IPA. The first syllable "vi" is pronounced as [vi], with a short "i" sound followed by a short "i" sound. The second syllable "du" is pronounced as [du], with a short "u" sound followed by a voiced "d" consonant. The final syllable "ka" is pronounced as [ka], with a short "a" sound followed by an unvoiced "k" consonant. Therefore, the spelling of "viduka" accurately represents the pronunciation of the word.