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Examples: ultra-ambitious semi-invalid Rule 4. When a prefix ends in one vowel and a root word begins with a different vowel, generally attach them without a hyphen. Examples: antiaircraft proactive Rule 5. Prefixes and root words that result in double e's and double o's are usually combined to form one word. Examples: preemployment coordinate Exceptions: de-emphasize co-owner Rule 6. Hyphenate all words beginning with self except for selfish and selfless. Examples: self-assured self-respect self-addressed Rule 7. Use a hyphen with the prefix ex. Example: His ex-wife sued for nonsupport. Rule 8. Use the hyphen with the prefix re only when: the re means again AND omitting the hyphen would cause confusion with another word. Examples: Will she recover from her illness? Re does not mean again. I have re-covered the sofa twice. Re does mean again AND omitting the hyphen would have caused confusion with another word. The stamps have been reissued. Re means again but would not cause confusion with another word. 104
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