In the South, when the word root of a ㅂ-irregular inflected word has two or more syllables (for example, 고맙다 "gomapda"), the ㅂ is dropped and replaced with 우 in the next syllable. When conjugated to the polite speech level, the ㅂ-irregular stem resyllabifies with the 어요 "-eoyo" conjugation to form 워요 "-woyo" (as in 고맙다 "gomapda" → 고마우 "gomau" → 고마워요 "gomaweoyo"), appearing to ignore vowel harmony. ㅂ is not replaced with 우 in the North (as it also was in the South before the 1988 "Hangeul Matchumbeop"). The vowel harmony is kept in both the South and the North if the word root has only one syllable (for example, 돕다 "topta"/"dopda").