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Matches Japanese syllables in romaji (romanized Japanese), including standalone vowels (a, e, i, o, u), consonant-vowel pairs (ka, shi, tsu, etc.), palatalized sounds (sha, chu, ryo), the syllabic n (nn), and double consonants (kk, pp, ss) used to represent the small tsu (っ). Useful for parsing transliterated Japanese text or tokenizing romaji into individual mora/syllable units.