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In page Hiragana:

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Hiragana and katakana are both kana systems. With few exceptions, each mora in the Japanese language is represented by one character (or one digraph) in each system. This may be a vowel such as /a/ (hiragana あ); a consonant followed by a vowel such as /ka/ (か); or /N/ (ん), a nasal sonorant which, depending on the context and dialect, sounds either like English m, n or ng ([ŋ]) when syllable-final or like the nasal vowels of French, Portuguese or Polish.[citation needed] Because the characters of the kana do not represent single consonants (except in the case of the aforementioned ん), the kana are referred to as syllabic symbols and not alphabetic letters.[4]