A. Use the hyphen with the compound numbers twenty-one through ninety-nine, and with fractions used as adjectives.

CORRECT: Sixty-five students constituted a majority.

CORRECT: A two-thirds vote was necessary to carry the measure.

B. Use the hyphen with the prefixes exall, and selfand with the suffix elect.

CORRECT: The constitution protects against self-incrimination.

CORRECT: The president-elect was invited to chair the meeting.

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