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In page Vowel harmony:

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The vowel that causes the vowel assimilation is frequently termed the trigger while the vowels that assimilate (or harmonize) are termed targets. When the vowel triggers lie within the root or stem of a word and the affixes contain the targets, this is called stem-controlled vowel harmony (the opposite situation is called dominant).[1] This is fairly common among languages with vowel harmony[citation needed] and may be seen in the Hungarian dative suffix: