Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
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Question: What word is used in mathematics to mean if and only if?

Answer: if and only if

Question: Which American playwright wrote The Iceman Cometh and Long Day's Journey Into Night?

Answer: eugene o'neill

Question: Haight and Ashbury are streets in what city?

Answer:
san francisco