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Root Word Begins Correct Hypenation Ultra Ambitious  Semi Invalid Hypenate

Front why is this correct hypenation?

ultra-ambitious 
semi-invalid
Back you should hypenate prefixes ending in an a or an i when the root word begins with the same letter

However: When a prefix ends in one vowel and a root word begins with a different vowel, generally attach them without a hyphen.

Examples: 
antiaircraft

Tags: grammar

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