Because many people are not acquainted with the features of Korean text, it is worth discussing some of the characteristics of the two different coding methods: decomposed jamos versus precomposed syllables.
Modern Hangul syllable blocks can be expressed with either two or three jamos, either in the form consonant + vowel or the form consonant + vowel + consonant. There are 19 possible leading (initial) consonants, 21 vowels, and 28 trailing (final) consonants. This results in 399 possible two-jamo syllable blocks and 10,773 possible three-jamo syllable blocks, for a total of 11,172 modern Hangul syllable blocks.
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