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a book that sells in very large numbers
If he has been to Spain, he will speak Spanish well .
He will not speak Spanish well unless he has been to Spain.
He who has never been to Spain speaks Spanish well.
He speaks Spanish well but he has never been to Spain .
He speaks Spanish well because he has never been to Spain
The boy was too tired to sleep
Since the boy was tired he slept
The boy was tired enough to sleep
The boy couldn't sleep because he wasn't tired
the boy slept because he was tired